Greninja seems to be a tough Pokémon in reference to his personality. Since he hatched, he preferred being alone to train instead of socializing with the others. When he was asked to join, he politely refused, which was then met with him getting attacked by rest of the Froakie. This made him distant towards others despite doing good. This lead to him leaving many of his previous trainers as his natures didn't meet with them. He finally chose Ash after seeing his bravery and being shown love. Greninja even has the tendency to blush when it is thanked and praised by other Pokémon and people. For example, when it used its Frubbles to tidy up Fennekin's tail, it thanked Froakie for its thoughtfulness. Greninja is also very protective towards others and is willing to keep them safe from harm. For example, when everyone got separated after an attack from angry Pangoro, Frogadier stepped forth and protected Serena and Chespin. One of Greninja's greatest insecurities was his close bond with Ash, as failing to perfect the Ash-Greninja form took a toll on both Ash and Greninja alike. When Ash left Greninja in the Pokémon Center out of guilt for losing against Wulfric, Greninja gave chase to look for his trainer. While Greninja was recovering from the battle, he also felt responsible for making Ash lose the battle. However, after fully synchronizing their feelings to save a Spewpa from falling, Ash explained to Greninja why he chose to be a Pokémon master and he views Pokémon as friends. After that, Greninja and Ash fully came to understand each other.
Before he joins with Ash while it was a Froakie, he is highly observant and a risk taker when he saves Pikachu from Jessie's Wobbuffet's Mirror Coat to counter his Electro Ball against him.
In one episode, Greninja while it was still a Froakie has a short fierce rivalry with Ash's Hawlucha when they are not getting along during the double battle with both Clemont's Bunnelby and Chespin and they are usually seen arguing during Ash's special training of combining their moves. But they later settle their difference after seeing Ash risking his life to save them from being hit on Trenevant's Will O Wisp and became friends after they teamed up to stop Team Rocket's Pokemon.
At the start of A Fashionable Battle! and onward, Greninja while it was a Frogadier gains a friendly rivalry towards Sawyer's Treecko who is furious not to give up the fight after being hit from his Water Pulse twice and leading its evolution to Grovyle and later Sceptile and its mega evolve form, Mega Sceptile. Their rivalry was demonstrated during the 3 on 3 battles between Ash and Sawyer as their fight is equally matched and both of their Pokemon are seen either of the two will win or lose. This also happens when both competed each other in the Lumiose Conference which is the Kalos League.
Since he hatched, he preferred being alone to train instead of socializing with the others. When he was asked to join, he politely refused, which was then met with him getting attacked by rest of the Froakie. This made him distant towards others despite doing good. This lead to him leaving many of his previous trainers as his natures didn't meet with them.
Greninja first appeared as a Froakie when he observed Pikachu shocking Bonnie, Clemont and Ash outside the Lumiose Gym. It followed the group to a nearby park, where it watched the trio talking from a tree. When the group were attacked by Team Rocket who actually followed Ash on his journey to capture his Pikachu, Froakie protected Pikachu from its own Electro Ball, which had been rebounded by Wobbuffet's Mirror Coat. He then used the sticky bubbles on his back, called Frubbles, to hit Wobbuffet, and helped Ash defeat Team Rocket. After Team Rocket were blasting off, Froakie fainted due to its heavy injuries and Ash took him to Professor Sycamore's lab.
Eventually, Froakie was healed at Sycamore's lab. Froakie was present when Team Rocket tried to take control of Professor Sycamore's Garchomp who saves him from getting controlled and assisted Ash in his attempt to help. When Garchomp was about to fall off the Prism Tower, Froakie used his Frubbles to stick Garchomp's feet to the floor and prevent it from falling. This then allowed Pikachu to destroy the machine controlling Garchomp with Iron Tail. At the end of the episode, Froakie appeared in front of Sycamore's lab with a Poké Ball and asked Ash to catch it, which Ash agreed as Froakie quickly clicks the Poke Ball to make Ash obtains his first Pokemon much to his excitement.
Froakie quickly attacked a Fletchling that made Bonnie cry and a Dedenne leave, despite Ash telling him to stand down and let Pikachu attack. Fletchling easily evaded every attack and almost knocked Froakie out with a devastating Razor Wind, but Ash pushed him away to save him. Although the group was initially mad, they learnt of Froakie's motives, and made a plan for him to take down Fletchling. They lured Fletchling to an area with many rocks at many levels, which allowed to use Froakie to move freely and be on even grounds with the flying-type. However, Fletchling's aerial speed allowed it to evade all of Froakie's attacks, although Froakie evaded his just as well. Fletchling then got a solid hit on a hidden Froakie, that was actually a fake made of Frubbles. Froakie then finally landed a hit with his newly learned Bubble, and Ash attempted to capture it, but failed. Froakie then evaded the powerful Razor Wind and finished Fletchling off with Water Pulse, allowing Ash to capture it.
Froakie was used again using his Frubbles for Pikachu and Fletchling to dodge, in preparation for Ash's rematch against Viola. Froakie was sent out to battle Clemont's Magnemite and Magneton, and despite the type disadvantage, Froakie single handedly incapacitates them with his Frubbles.
Later, Froakie was used to battle Sanpei and his Frogadier. But because of Frogadier's intense speed and power, it lost. Froakie then tried to become super fast and strong by trying to learn Quick Attack. However, when Team Rocket attacked, it instead learned Double Team.
Froakie was then used to battle Grant's Onix in Ash's second Kalos Gym Battle, which Froakie successfully did when a newly formed strategy called the Rock Tomb Climb. Froakie then battled Grant's Tyrunt, but was easily defeated with a powerful Draco Meteor.
Froakie was later used to battle a Hawlucha Ash made friends with after settling a rivalry with a Machamp. However, the battle ended when Hawlucha's Flying Press collided with Froakie's Pound attack, knocking both Pokémon out in a draw. Froakie was later seen with Pikachu happily excited to see Ash easily caught Hawlucha.
Sometime later, Froakie was doing some training sessions with Ash and his Pikachu. But when a log came hurdling down from a waterfall, Froakie defended Pikachu's life and learned Cut to stop the log from falling on Pikachu. Froakie later got into a squabble with Hawlucha and began to fight each other. Their fighting didn't last long until a Trevenant kidnapped Ash and dragged him into the forest. When Froakie and Hawlucha attempted to save their trainer, they learned that the reason why Trevenant kidnapped Ash was because it needed his help in saving its companions, a Bonsly and a Sudowoodo, who were caught in an electric net set up by Team Rocket. After Pikachu freed the two Rock-types and got caught his enemies, Froakie and Hawlucha worked together using their combination moves against both Inkay and Pumpkaboo. With the help of Trevenant to destroy the device that captures Pikachu in Meowth's hands, he was finally released and blast Team Rocket off with his Thunderbolt. Froakie and Hawlucha finally settle their differences, becoming best friends in the process.
Froakie is seen with Clemont, Serena and Bonnie watching Ash's Gym battle against Korrina using Hawlucha, Fletchinder and Pikachu. When Team Rocket intervenes due to their motives of stealing, Froakie stops them in their tracks using its Frubbles. With the aid of Serena's Fennekin and Clemont's Chespin, it manages to distract both Inkay and Pumpkaboo long enough by using Frubbles to stop their attacks allowing both to blast them off with both Fennekin and Chespin's Flamethrower and Pin Missile combination. Froakie later hugs Ash after winning the Gym battle against Korrina when Pikachu uses most of its attacks to defeat Mega Lucario.
Froakie was released by Ash while teaming up with Pikachu, Serena's Fennekin and both Clemont's Luxio and Chespin to break the large boulder with their powerful abilities to make the wild Lapras to move from the river stream down through the ocean before being confronted by Team Rocket.
Sooner or later, Froakie was practicing using Water Pulse to hit the trees as targets along with Ash's Pikachu who uses his Thunderbolt until the group found Sanpei and his newly evolved Greninja drifting in the river stream, unconscious making Ash swims to take them in safety. Sanpei finally wakes up to be reunited with Ash after informing him that his Greninja was okay since Clemont feeds it with a Pecha Berry to cure his poison status due to the effects of Poison Jab. Ash was surprised that Sanpei's Greninja had evolved while it was a Frogadier which Sanpei guesses it. Sanpei finally explains to Ash about what happened to both of them getting hurt until they are confronted by a ninja named Saizo and his Pokemon, Saizo's Barbaracle. When his Pokemon attempts to unleash its Razor Shell, Froakie deflects it with Cut but its not enough due to its strength causing to be knock down and angrily frustrated to see how strong Barbaracle is even withstanding Pikachu's Thunderbolt. With no other options, Sanpei use Leaf Shroud to escape with Ash and the group.
While they were hiding, Sanpei finally shows the secret scroll that Saizo was searching for and it was his mission to deliver this scroll before sun down. In Sanpei's flashback, Saizo which happens to be Sanpei's instructor who gives Sanpei the secret scrolls to him to delivered it on the manor. Therefore, they got ambushed by a masked ninja in the woods unaware that both masked and unmasked Saizo are the same person. Both ninjas clashed as Saizo's Barbaracle manage to poison his Greninja with Poison Jab. Before it deals a final blow, Sanpei tackles his Greninja down through the river stream before he was found by Ash and the group. After hearing Sanpei's story, Ash decides to assists him whenever they can and Serena, Clemont and Bonnie also decided to help as well even risking their lives.
When they balanced through the mountain cliffs, both Serena and Clemont fell into the broken path only to be saved by both Froakie and Greninja using both its tongue and its frubbles to make them safe. As they enter to the cave which happens to be Golbat's territory. After Sanpei makes escape using his Greninja's Smokescreen, they found the manor where he could deliver the scroll as both Serena and Clemont are separated. They are soon confronted by Saizo and his Barbaracle. Froakie teams up with Greninja to fight his Barbaracle in an handicap by using Double Team to hit directly with both Water Shuriken and Water Pulse only to be dodged. Ash's Pikachu assists them to use Electro Ball only to be slashed by Barbaracle's Razor Shell. When Team Rocket intervenes due to their bent of capturing Pikachu, Saizo destroys the net with his kodachi along with Barbaracle's Razor Shell and becomes angered for their interference, he let Barbaracle knocks both Meowth and Wobbuffet down allowing both Ash's Froakie and Sanpei's Greninja with both Water Pulse and Water Shuriken combination to blasts them off. Their fight is finally resumed and his Barbaracle use Poison Jab on Greninja who dodges the attack. Froakie assists Greninja using Double Team while using Cut and being aided by Pikachu who uses Iron Tail. They are soon hit by Barbaracle's Mud Shot causing both Pokemon to get blind while Froakie was knocked on the wall. As Barbaracle deals the final blow to both Pikachu and Greninja, Froakie witnesses the ordeal and desperate to save them both and it yells while the rocks that knocks him off was exploded as it attacks Barbaracle with a Headbutt while evolving into a Frogadier to knock it down much to Ash's excitement while looking at his Pokédex.
Frogadier makes an equal fight against Barbaracle using its Cut while the latter does the same using its Razor Shell. Frogadier overpowers Barbaracle using his newly learned Aerial Ace multiple times making Saizo and his Pokemon retreated using his Leaf Shroud and tells them to meet at the manor.
Arriving at the manor, they are reunite with Serena, Bonnie and Clemont as Saizo reappears to both Ash and Sanpei. Saizo reveals himself by removing the mask much to Sanpei's surprise and the secret scroll he gave him has no written on it. Saizo tells him that he did that to testing him for his ninja capabilities and battles during his journey. As the group surprises Frogadier, Clemont recognizes Ash's Froakie had finally evolved and Bonnie wants him to be Froakie again to find out how he evolved much to Frogadier's disappointment. Frogadier is last seen fighting with Sanpei's Greninja due to Ash challenges Sanpei in a battle.
Frogadier was later released by Ash after its Poke Ball had dropped on its pocket due to them being bound by Team Rocket who manage to capture his Pikachu and a wild Goomy. Ash tells it to use Cut to cut the bound which Frogadier successfully do it allowing Ash to release his Fletchinder to find Team Rocket's whereabouts.
Frogadier along with Ash and the group's Pokémon are having a short break until it was disrupted by Team Rocket. The lake that Frogadier and the others swim turns out to be a home of the wild Lotad and Lombre who are attacking with their attacks to get the heroes separated. Ash and Clemont are lucky that their Pokemon are safe and sound making the two recalled their Pokémon back to find Serena, Bonnie, Dedenne and Goomy.
Frogadier was later used by Ash along with Pikachu, Serena's Fennekin and Clemont's Luxio against a robot manned by Team Rocket using Vanillite and its friends who are Vanillite's evolutionary stage, Vanillish and Vanilluxe are forced to use their ice abilities. After Ramos disperses the blizzard from the robot machine by using his Gogoat's Grass Knot and Leech Seed combination. Frogadier slices the air vent with Cut allowing the trio to use their Ice Beam to freeze the robot down and Pikachu releases the trio with Iron Tail while letting the trio freeze them on frozen solid using its Blizzard. As the robot is still in a frozen state much of the Team Rocket trio's horror, they were blasted off by Ash's Pikachu's Thunderbolt, Frogadier's Water Pulse, Clemont's Luxio's Swift and Serena's Fennekin's Flamethrower.
Frogadier was later used in Ash's gym battle against Ramos and his Weepinbell while in a ninjutsu stance. Although Weepinbell managed to defeat both Fletchinder and Hawlucha, Frogadier does its best to deal of Weepinbell's abilities but it found him when unleashing its Double Team. Frogadier also uses its frubbles to cover its mouth similar to a health mask to avoid getting poisoned from its Poison Powder and unleashes its Double Team to confuse Weepinbell long enough. Frogadier defeated the Flycatcher Pokémon with a single hit from Aerial Ace after he cuts Weepinbell's Grass Knot when it attempted to trip him through the ground during his Double Team ability. He later fought against Ramos' Gogoat. During the battle, he was weakened by Gogoat's strong Grass-type moves. But, after recalling the lesson Ramos taught Ash before the battle, Ash and Frogadier managed to come up with a strategy by deflecting most of its Razor Leaf with Aerial Ace and dealing enough damage to Gogoat with the same attack. Frogadier uses Double Team to make Gogoat use its Vine Whip to destroy its illusion state and Frogadier defeats it with a blast of Water Pulse making Ash the winner. Frogadier happily hugs Ash for his victory and he was seen with Pikachu and Hawlucha when Ash earns his Plant Badge from Ramos.
Frogadier was released along with Goomy, Fletchinder and Hawlucha to go with Clemont and Serena's Pokémon to stay with Clemont and Bonnie to the Pokémon Center to wait for Ash and Serena to buy presents because of the traditional festival held in the city which Ramos informs them. Inside the Pokémon Center, Frogadier watches with other Pokémon when Bonnie did her best to take care of them even the argument between both Clemont's Chespin and Serena's Pancham when the latter accidentally bumped into him. He also volunteers with the others about Bonnie to drew them using crayons. During the festival, Frogadier senses someone vacuums all of the gifts which he uses Water Pulse to hit on the bush which reveals to be Team Rocket who is responsible for stealing all of the gifts in the festival using their vacuum machine. Frogadier fights equally with Jessie's Pumpkaboo by deflecting its Shadow Ball using Water Pulse before they were blasted off by Serena's Fennekin's Flamethrower, Ash's Pikachu's Thunderbolt, and Clemont's Chespin's Pin Missile. During the festival, Frogadier is among with the other Pokémon are inpressed on Bonnie's drawing about them and was happy with Hawlucha, Fletchinder and Pikachu when Ash gave them a bunch of berries as a gift for them and letting have with other Pokémon to have a picnic. Frogadier also watches with the other Pokémon some fireworks display after Ash gives a gift to Serena.
Frogadier was released by Ash while they are being held captive by Team Rocket and a rogue Grumpig where both Dedenne and Goomy fought. He let Frogadier to use its Water Pulse to soften the rock several times to make Ash tackles the bar to save Goomy who kept using Bide to attack Grumpig. After Team Rocket is blasted off by Ash's Pikachu's Thunderbolt due to a distraction made by Goomy who is now evolved into Sliggoo by using its Dragon Breath to deflect their Pokémon's attack, Frogadier became impressed to see Sliggoo fight while he watched all of the wild Spoink getting angry towards the rogue Grumpig who finally apologizes for his horrible actions after being betrayed and used by the Team Rocket trio and one of the Spoink who gave it an apple to accept for his apologies much to Grumpig's happiness.
Frogadier is later used by sticking the ventilators with its Frubbles from the air vent making Ash and the group to break inside the Kalos Power Plant to save Pikachu, Dedenne and Luxio while being controlled by Team Rocket who manages to take over the power plant.
Frogadier teams up with Ash's Fletchinder against Florges and her Bug-type Pokémon army when they manage to captured Pikachu, Dedenne and Goodra's long time friend, Wooper due to Team Rocket's trick and manipulation. But both were quickly defeated.
Froagadier is seen with Ash, Clemont, Serena and Bonnie and their Pokemon are drinking with refreshments until they are spotted by Team Rocket. After the three Pangoro attacked with their abilities to make them separated, Frogadier is with Serena and Clemont's Chespin who serves as a brief bodyguard. Frogadier also manage to blind one of the three Pangoro using its frubbles to make himself, Serena and Chespin to run away until they are found by Ash's Fletchinder finally regroup with Ash, Pancham, Hawlucha and Clemont's Luxray. Frogadier finally recalled back when the group finally reunite with Pikachu, Serena's Braixen, Clemont and his Bunnelby.
In Scary Hospitality!, Frogadier was released by Ash to use its frubbles to make him open the rusted door to reunite with Clemont.
Frogadier was used in a double battle against Ash's second new rival, Sawyer. He teamed up with Hawlucha during the battle between Sawyer's Treecko and his Bagon, despite having a type-disadvantage. Frogadier also deflects Bagon's attack with Water Pulse to make Hawlucha not to get hit. Frogadier highly jumps so high to dodge Treecko's Bullet Seed on the ground and also deflecting most of its Bullet Seed using Cut in mid-air and quickly slashed Treecko with another Cut in explosion, defeating it. But just as Frogadier and Hawlucha were about to finish the battle, it was called-off due to a fashion show being held in Laverre City, which is hosted by the gym leader, Valerie. Frogadier is seen with Pikachu, Fletchinder and Hawlucha are eating their Pokemon food. But once Ash is pumped up for their special training due to Valerie's unoffical battle against Sawyer, all four of them are excited to be trained as they quickly finishes their food.
Frogadier was used in a three on three battle against Sawyer. It battled with Sawyer's Treecko once again. Frogadier manages to take down Treecko with a punch and a kick using its Aerial Ace but Treecko counters it with Bullet Seed making Frogadier blocks it with both hands despite the damage was super effective as he keeps dodging its Bullet Seed with its unique athleticism causing Treecko to chase it quickly using Agility. But Frogadier hits it directly with Water Pulse in mid-air making Treecko became furious and it angrily roars to evolve into Grovyle. Sawyer was amazed by this after Ash told him about the reason of Treecko's evolution to Grovyle because of his passion of battling. With that, Grovyle tries to warm up for the battle while unleashing its newly learned Leaf Blade. Despite having a disadvantage against Grass-types, Frogadier uses Double Team to make Grovyle slashes its multiple illusions with Leaf Blade but the real Frogadier outsmarts it by hitting from behind using Aerial Ace. Frogadier dodges most of Grovyle's moves even fighting each other using both Cut and Leaf Blade to resemble a sword fight. Frogadier manages to deflect Grovyle's Bullet Seed with Water Pulse to make an explosion but Grovyle manages to strike him down with Leaf Blade in mid-air. When the smoke from the explosion comes out, it was revealed that Frogadier dodges the move by jumping so high and hitting Grovyle from behind with Water Pulse in mid-air, defeating it. Ash manages to won the triple battle with Sawyer, but his Grovyle gains a friendly rivalry in the process after being defeated by Frogadier for the second time and both Frogadier and Grovyle are seriously staring each other knowing of their rivalry.
Frogadier was seen having a break with all of Ash and the group's Pokemon until Ash recalls it back before Hawlucha found a Pokemon egg which it later hatched into a baby Noibat due to Ash and the others are making the egg warm and Fletchinder's ability Flame Body. Frogadier was later released by Ash to fight Team Rocket's Pokemon, James' Inkay and Jessie's Pumpkaboo and defeats them easily with both Water Pulse and Aerial Ace allowing Pikachu to blasts Team Rocket off with its Thunderbolt.
Frogadier teams up with Ash's Hawlucha to help Ash fixing the roof during heavy rains. Frogadier uses its Frubbles to make Ash cross the roof without slipping while Hawlucha helps Ash when he fixes the roof to stop the leak that causes a short circuit. Ash tells Frogadier to check the other roof if they have holes on them which he agreed.
Frogadier was released to help Fletchinder and Trevor's Charmeleon to battle a rampaging Moltres due to Moltres thinking that Ash and the others were enemies when Frogadier fire a Water Pulse it evaporated. When Fletchinder was badly hurt from Moltres' Flamethrower attack he show concern for his friend then stop Ash from leaving to go help it along with Pikachu and Trevor. Moltres turns to them due to Ash telling Fletchinder to wait for him lucky for them they were saved when Fletchinder desperately tries to protect them by shielding itself from Moltres' Flamethrower in a direct hit while it evolves into Talonflame. Frogadier saved his trainer and Talonflame from being incinerated into the volcano by using his frubbles to make a rope at the last minute as he and Ash's friends tried to pull them up. After they leave the mountain, Frogadier, Pikachu and Ash comment to Talonflame that they have a lot of work to do and they are seen having a high five when Trevor takes a photo of them.
When Ash and Frogadier met Olympia, she read his memories and along with seeing a vision of it gaining a new power, she revealed that at the Froakie breeding facility, as a Froakie, he preferred being alone to train instead of socializing with the others. When he was asked to join, he politely refused, which was then met with him getting attacked by rest of the Froakie. This made him distant towards others despite doing good, and it wasn't until Ash showed him love that made him finally connect to a trainer that understood him.
Greninja battled against Sawyer and his newly evolved Sceptile. During the battle, he used his special form and defeated Sceptile. Little did Greninja, Ash and the others know, a trainer named Alain was watching the battle and witnessed him changing form. Alain was amazed at Greninja's strength, which was a form that he has never seen before, and decided to battle Ash to test Greninja's form. In the battle, Alain Mega Evolved his Charizard while Greninja activates its special form. But even though Greninja had a huge advantage over Charizard, Greninja wasn't able to keep up with Mega Charizard X's power and was easily defeated.
Ash and his friends, along with Greninja, had been trying to figure out the mysterious power Greninja has been using since he evolved. In order to get it to appear, Clemont strapped one of his machines on Greninja and Ash's wrists so he could analyze each other's pulses. Clemont decided to use his Luxray in order to get Greninja to reveal its special form. However, the battle was interrupted when Alain showed up and Ash asked him for a rematch, which he agreed. Once again, Alain used his Charizard to battle Greninja. During the battle, Alain Mega-Evolved his Charizard while Greninja activated its special form. However, since Greninja pushed too hard on using its form so much, Ash collapsed to the ground and the battle was called off. When Ash regained consciousness, Ash realized that he and Greninja would have to be more careful in using that form.
Ash and Greninja went through some serious training in a forest. But during their training, they met up with the Kalos League champion, Diantha, who told them about the upcoming disaster that is being caused by Team Flare and their goal of using the Legendary Pokémon, Zygarde to accomplish their evil plans. When Diantha heard about the strange power Greninja has been using, she decided to have a rematch with Ash by using her Gardevoir. During the battle, Greninja held it's own after a rough start and managed to reach its final form of its power, which took everyone including Ash by surprise. Diantha then Mega-Evolves her Gardevoir to test Greninja's form. But despite utterly overpowering Gardevoir and almost defeating it, Ash and Greninja pushed themselves too hard and passed out again, leaving Diantha and Gardevoir to fend off Team Rocket themselves. When Ash and Greninja regained consciousness, they both vowed to fully master the Ash-Greninja form.
Greninja was later used as Ash's third and final Pokémon in his three-on-three battle against Sawyer, after facing and beating a Trainer and his Scizor. Greninja was used to battle against Sawyer's Clawitzer and managed to defeat it. Greninja then battled Sawyer's Sceptile again, hoping to activate and master its form. Only this time, it failed to work because Greninja and Ash were not in complete synch with each other. And because of that, Greninja was immediately defeated. After the battle, Ash thanked Greninja and recalled him back to his Poké Ball. But despite this, both Ash and Greninja are doubtful in their ability in mastering the Ash-Greninja form.
Greninja was used in the Gym Battle against Wulfric and his Avalugg. Despite getting damaged by the hail storm and Avalugg activating its Ice Body ability, Greninja used its speed and power to hit Avalugg and dodge the Stone Edge attacks. Greninja even managed to counter Avalugg's Gyro Ball attack with Cut, freeze Avalugg's feet to the ground with Water Shuriken, and deliver a powerful Cut to Avalugg's head. Soon, at the point where Ash gained the upper hand, Greninja activated his Ash-Greninja form and eventually overwhelmed Avalugg. But despite this, Wulfric took advantage of Greninja's speed and newfound power and had Avalugg use Avalanche on Greninja, which causes Ash to suffer intense pain. Greninja kept on attacking Avalugg, but Greninja wasn't able to keep up with Avalugg and was immediately defeated, causing Ash to suffer more pain and fall to his knees. After the battle, Wulfric explained to Ash that even though he trained Greninja very well, he doesn't have enough trust in their bond, which greatly shatters Ash's confidence. While Greninja was recovering from the battle, Ash, upon realizing how badly hurt he was from the battle, decides to leave Greninja and walked away into the Winding Woods alone and depressed. But little does Ash know, Greninja was awake at the time when Ash was talking to him and he heard everything he said before he left.
The following morning Greninja left on his own with everyone thinking he went to go look for Ash, but in reality he was up on a tree in the woods somewhere thinking back on his loses, leaving him upset. As he sat in the tree, he was mad at Ash for not coming back, thinking he's leaving him forever. However, Greninja remembered what Ash said before he left, which made him realize that Ash has not been himself lately. Greninja became angry at himself for not thinking about it sooner and punches the tree out of frustration. With no hesitation, he decided to look for him just before the blizzard started. With the help from Squishy in its 10% form, he manages to find Ash saving him from falling in the process and helped him save a Spewpa from falling further down as well along with them finally perfecting the Ash-Greninja form. Soon, they spent a night in the cave where they took care of some of the lost Pokémon they found. Ash and Greninja both made amends for their past mistakes. Ash tells Greninja that after being alone, the promise he made with Sawyer, how he wanted to get 8 badges faster, and how he wanted to beat Wulfric so badly, he realized that he got very impatient and completely forgotten how important being a trainer really is. Ash and Greninja agreed to start things over from zero again. As the blizzard died down, Ash and Greninja reunited with the others and made amends with them for worry them. Greninja and Ash soon learned that the Kalos League will be held in Lumiose City, which reminded them of the time they first met before their journey.
The next day, Greninja was used as Ash's third and last Pokémon in the rematch against Wulfric. This time, he battled against his Abomasnow and with his newly mastered Ash-Greninja form, Greninja was able to gain the upper hand. However, the tables were soon turned when Wulfric Mega-Evolved his Abomasnow, which took Ash, Greninja and everyone else by surprise. But despite Abomasnow increasing its power, Greninja was able to pull through with its speed and Ash's creative tactics which successfully defeated Abomasnow, thus earning Ash the Iceberg Badge and qualifying him to enter the Kalos League.
Later on, Ash entered the Lumiose Conference and used Greninja against Titus and his Altaria. During the battle, Greninja used his Ash-Greninja form and defeated Altaria, surprising everyone in the stadium.
Greninja was used as Ash's last Pokémon during his six-on-six full battle against Sawyer in the Lumiose Conference. Once again, he went up against his long-standing rival, Sawyer's Sceptile. The two of them battled evenly until, Greninja, with complete trust in his trainer, activates his Ash-Greninja form while Sceptile mega-evolved into Mega Sceptile. Despite having minimal damage from getting hit by Leaf Storm and Frenzy Plant, Greninja was able to hold himself together and successfully defeated Sceptile, thus qualifying Ash to advance to the final round of the Kalos League.
Greinnja was used as Ash's last Pokémon during his six-on-six full battle against Alain in the finals of the Lumiose Conference. Goodra's Rain Dance helped give Greninja the advantage and the latter defeated Alain's Bisharp. Aftwerwards, he once again went up against Alain's Charizard; however during the battle, the rainclouds disappeared and Greninja activated the Ash-Greninja for through Bond Phenomenon while Charizard Mega-Evolved into Mega Charizard X. But despite his best efforts like using a super powerful Water Shuriken as a trump card, Charizard defeated Greninja after a good battle, thus leaving Ash as Runner-up in the conference.
Shortly after Team Flare and Lysandre began their assault on the city, Greninja was cuffed and hang up in air unconscious at the time by Lysandre behalf,who intends to use him and Ash Bond Phenomenon for his plans along with Lysandre using his friends as hostages for both of them, at the top of Prism Tower. Looking at the horror and destruction of Lysandre's plans, Lysandre tried to take control of Ash and Greninja with the mini version of the Mega Evolution Energy machine. However, Ash and Greninja defied Lysandre's evil plans and broke free from the cuffs with Bond Phenomenon. After that, Alain, who turned against his former boss after learning about his treachery, freed the rest of Ash's Pokémon. Greninja then fought against Lysandre's Pyroar and Shiny Mega Gyarados.
After most of Ash's team were wiped out by Lysandre's Mega Gyarados, Greninja, Charizard, and Pikachu were the only Pokémon left to fight. However, Malva and her Mega Houndoom unexpectedly showed up and assisted everyone in battling the villainous Lysandre. When Malva opposed Lysandre's plans, Lysandre tried to kill her with his Mega Gyarados's Incinerate attack. But Greninja blocked the attack with Water Shuriken to protect her. After a hard battle, Greninja, Charizard, and Pikachu managed to successfully defeat Mega Gyarados. However, Lysandre refused to surrender and literally jumped off the Prism Tower. Greninja tried to prevent him from falling, but failed to reach him with his tongue.
Greninja was later sent out to help Serena's Braixan, Professor Sycamore's Mega Garchomp, and Steven's Shiny Mega Metagross fight against the Giant Rock, which was heading to Anistar City's sundial so it will fuse together and create an explosion that will wipe off every living being on the planet. In the process, Greninja managed to track Chespie's location with the artificial creature and used Water Shuriken to show where it is. when it seemed that Greninja, Braixen, Mega Garchomp, and Mega Metagross were about to face their doom, the Kalos Gym Leaders and Diantha showed up with their Pokémon.After strategizing their plan of saving Chespie, everyone combined their powers to fight off the Giant Rock, which allowed Ash and Alain to reach into the core and rescue Chespie, thus bringing the Megalith to a halt. However, when everyone tried to destroy the Giant Rock, Lysandre surprisingly showed up and resurrected the creature with his remote control. But Greninja, Pikachu, and Charizard managed to destroy Lysandre's remote, which allowed Squishy and Z-2 to destroy the Giant Rock and finish Lysandre off once and for all.
After Team Flare's evil ambitions were finally put to an end, Greninja was sent to save Pikachu from Team Rocket. He used Water Shuriken to block Inkay's Psybeam and Gourgeist's Dark Pulse. Finally, Greninja used Cut to free Pikachu. Later on in the episode, Greninja and the rest of Ash's Pokémon received Honor of Kalos medals for their heroic efforts against Team Flare.
After saying good-bye to Goodra in the marshlands, Ash and friends were heading back to Lumiose City. But on they're way back, a strange plant erupts from the ground, attacking the group. Greninja popped out of his Poké Ball and activated its Ash-Greninja form with Bond Phenomenon. Ash and Greninja sensed that there is red energy in the plant and Greninja destroyed the plant with Water Shuriken. Suddenly, Xerosic, the head scientist of Team Flare, arrived and began stealing Zygarde Cells with his Malamar. When he explained his plan of creating Neo-Team Flare, he abducted Clemont and drove away, believing he could use his intelligence as part of his plan. Greninja managed to track down Xerosic's vehicle and attempts to sneak in it to retrieve Clemont. However, he ends up getting caught when he accidently steps on a twig. Xerosic attacked Greninja and retreated, but Greninja went under his vehicle. As Xerosic starts to fly away in his invisible jet, Greninja held on the wing. Ash, Serena and Bonnie attempted to jump on the jet, but ended up falling off course. However, Greninja managed to save them with his tongue scarf. When they made it inside, they managed to find Clemont. Greninja became horrified when it seemed that Clemont is being controlled by Xerosic's Mega Evolution energy ray. However, it was revealed that Clemont placed a microchip on his head to prevent himself from being controlled. Greninja then battled along side with Chespin and defeated Xerosic's Crobat. After Xerosic was defeated and arrested by Officer Jenny, another plant sprouted from the ground and attacked the group again. Luckily, they were saved at the last minute by Squishy. Squishy then took Greninja and the others to meet up with Z-2. The two Legendary Pokémon told Greninja that the plants that attacked them was negative energy that was left behind from the Team Flare crisis. They knew that Greninja was gifted with the ability to see anything inside living things and asked him if he can lend them his strength to guide them during their mission. After a brief conversation with Ash and recalling the times they've had together in their journey, Ash and Greninja gave one final handshake and hugged each other, knowing that even when they are apart, they will always be connected. Greninja accepted Squishy and Z-2's request and the three Pokémon waved good-bye to Ash and his friends as they walked away into the forest together.
After destroying one of the roots that possessed the negative energy, Greninja looked in the sky and smiled as he sensed Ash's departure from Kalos.
|Water Pulse||Kalos, Where Dreams and Adventures Begin!|
|Bubble||A Battle of Aerial Mobility!|
|Pound||An Appetite for Battle!|
|Double Team (move) +||A Rush of Ninja Wisdom!|
|Cut +||Forging Forest Friendships!|
|Aerial Ace +||A Stealthy Challenge!|
|Water Shuriken +||A Festival of Decisions!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.
- Rock Tomb Climb
- Super Flying Cut
- Water Fuma Shuriken
- Ice Skates
Shortly after evolving into Greninja, through his strong bond with Ash, he can call upon a unique type of Evolution similar to that of Mega Evolution later called "Bond Phenomenon" as coined by Professor Sycamore where he takes on an appearance resembling his trainer while being covered in a water torrent veil. Its full capabilities and attributes were initially unknown, but it does give a significant boost in speed and power. They also share each other's point of view. However, little does Ash and his friends know, Greninja's new form comes with a side-effect. If Greninja gets attacked and takes damage while in this form, Ash will feel his pain. Later, discovered by one of Clemont's devices, it is revealed that Ash and Greninja share the exact same heartbeat when Greninja is in this form, so if it is pushed too hard, Ash may collapse from exhaustion.
In his second form, he has a full form that surpasses even the strongest Mega Evolved Pokémon (even if it is a Pokémon that he has type disadvantage against) with the Water Fuma Shuriken on his back which can deal massive damage to, if not defeat the strongest of his opponents in one hit (Greninja was able to defeat Mega Sceptile with just one hit from Water Fuma Shuriken; despite the fact that Water type moves have little effect against Grass type Pokémon). It also turn his Cut attacks into blue kunai blades. It's soon revealed that the reason why Ash and Greninja are having issues in mastering the Ash-Greninja form was because Ash and Greninja didn't have complete faith and trust in each other. While in the Winding Woods, Ash and Greninja made amends and were able to activate Ash-Greninja form at will. During the rematch against Wulfric, Ash and Greninja were able to use it without passing out, but even though they still share each other's pain, it seemed more manageable for Ash to control.
- Greninja's capture marks the first time since catching Heracross that Ash's first capture in a region has not been of the -type.
- Also, eventually as a Greninja, they're both dual-type Pokémon.
- Kalos is the second region where Ash catches only one starter Pokémon. The first was Hoenn where he caught Treecko. In this case, Chespin and Fennekin were caught by Clemont and Serena respectively.
- Greninja is the first of Ash's Pokémon to be owned by more than one trainer before its capture by Ash.
- Besides Pikachu and Oshawott, Greninja is the only other starter Ash got from a professor.
- Ironically, Oshawott and Froakie are the Water starters of their regions, which is what Ash wanted to start his journey with when he planned to pick Squirtle as his starter.
- Greninja is Ash's first Water-type starter Pokémon to fully evolve.
- It is the second of Ash's Water-type Pokémon to evolve out of all of them, the first being Kingler.
- Like Dawn's Quilava, Greninja is the second starter Pokémon to hatch from an egg belonging to a main character.
- Greninja is the first Pokémon belonging to a main character to evolve twice after hatching from a Pokémon egg.
- Coincidentally, both of Greninja's evolutions took place in an episode that Sanpei appeared in.
- Greninja is Ash's third dual-type Water Pokémon.
- Greninja is similar to Ash's Sceptile, Buizel, and Hawlucha;
- They have cool, calm, collected, and serious demeanors most of the time, yet are very protective of those close to them.
- They had a bit of a rivalry with other Pokémon, even in their own parties.
- They're always eager to face strong opponents.
- Greninja could be considered a contrast to Charmander, who as opposed to having a trainer who left him behind to fend for himself Greninja had a habit of leaving his trainers as a Froakie due to the fact that he wasn't impressed with them.
- This attitude is similar to Snivy.
- When Greninja transforms into Ash-Greninja, it gains the same sort of power that matches the power of Mega Evolution (except without the Mega Stones).
- So far, Greninja is Ash's only Pokémon to have an alternate form.
- Ash's Greninja has been the first and only Pokémon of Ash's that battled a Champion's ace Pokémon, held its own, even overpowering it and nearly winning.
- Greninja is the first out of Ash's Pokémon other than Pikachu to be used as part of a scheme for a villainous team other than Team Rocket.
- Greninja is Ash's first regional starter Pokémon to be released.
- Greninja's fighting style in its evolutionary stage and its athleticism is based on Ninjutsu and the way of using Aerial Ace that utilizes both punches and kicks are based on Taijutsu. His way of using Cut resembles a ninja sword resembles Naruto's signature move, Rasengan from the manga and anime series, Naruto and Shippuden.
- ^ XY002: Lumiose City Pursuit!, Ash mentions Greninja, as a Froakie, being a guy
- ^ a b XY002: Lumiose City Pursuit!
- ^ XY001: Kalos, Where Dreams and Adventures Begin!
- ^ XY003: A Battle of Aerial Mobility!
- ^ XY006: Battling on Thin Ice!
- ^ XY009: Clemont's Got a Secret!
- ^ XY015: An Appetite for Battle!
- ^ XY017: A Rush of Ninja Wisdom!
- ^ XY025: Climbing the Walls!
- ^ XY035: The Forest Champion!
- ^ XY038: Forging Forest Friendships!
- ^ XY039: Summer of Discovery!
- ^ XY044: Showdown at the Shalour Gym!
- ^ XY049: Bonnie for the Defense!
- ^ XY052: A Stealthy Challenge!
- ^ XY055: A Slippery Encounter!
- ^ XY056: One for the Goomy!
- ^ XY057: Thawing an Icy Panic!
- ^ XY058: The Green, Green Grass Types of Home!
- ^ XY059: Under the Pledging Tree!
- ^ XY061: An Oasis of Hope!
- ^ XY062: The Future Is Now, Thanks to Determination!
- ^ XY070: Beyond the Rainbow!
- ^ XY071: So You're Having a Bad Day!
- ^ XY073: A Fashionable Battle!
- ^ XY075: Rivals: Today and Tomorrow!
- ^ XY092: Cloudy Fate, Bright Future!
- ^ XY093: All Eyes on the Future!
- ^ a b XY100: A Festival of Decisions!
- ^ XY106: A Meeting of Two Journeys!
- ^ XY116: The Synchronicity Test!
- ^ XY118: Championing a Research Battle!
- ^ XY119: A Full-Strength Battle Surprise!
- ^ XY120: All Hail the Ice Battlefield!
- ^ XY121: Seeing the Forest for the Trees!
- ^ XY122: A Real Icebreaker!
- ^ XY125: A League of His Own!
- ^ XY128: A Riveting Rivalry!
- ^ XY131: Down to the Fiery Finish!
- ^ XY132: A Towering Takeover!
- ^ XY133: Coming Apart at the Dreams!
- ^ XY134: The Right Hero for the Right Job!
- ^ XY135: Rocking Kalos Defenses!
- ^ XY136: Forming a More Perfect Union!
- ^ XY137: Battling with a Clean Slate!
- ^ XY139: Facing the Needs of the Many!
- ^ XY140: Till We Compete Again!