Ash wears a new outfit which is different than his previous outfits. He wears a white and blue striped short sleeved loose collared shirt, brown capris with red outlines with baggy pockets and red folded sleeves at the edge of his capris and shades of blue sneakers. His hat is red and black and the Poké Ball design is white. Ash wears a silver Z-Ring on his left wrist which was later changed into a Z-Power Ring.
As a member of the Ultra Guardians, Ash wears an indigo and white uniform with light periwinkle accents as the edge of the short sleeves, collar and inlines of his uniform are black. He wears matching indigo gloves.
Since entering the Alola region, Ash is shown to be far more enthusiastic than he did in the Kalos region while at the same time kept his determination and his love for Pokémon. While Ash does retain his competence and experience, not getting upset over losing the Trial Challenges and defeating multiple Pokémon at the same time, he displays a considerably more childish and hyperactive demeanor.
Sun & Moon
Ash arrives in the Alola region on a vacation with his Mom, which Mimey won for them. After a nice Sharpedo ride, a run-in with a Bruxish that Lana caught on her line, a race with Grubbin then having some bad luck with a Bewear and some racing Tauros, Ash finds the Pokémon School where he meets Lillie, Mallow and Sophocles. Mallow mistakes Ash for a student and takes him to see Samson Oak, which conviently leads him to Delia and Mimey. Delia gives the Kantonian Vulpix Egg to Samson and Mallow shows Ash the rest of the school, including the classroom, where they meet Professor Kukui. After the meeting, Kiawe is confronted by Team Skull, who challenge him to a three on one battle, with the prize being his Charizard. Ash jumps in to help, defeating the Salandit and leaving the Zubat and Yungoos to be finished off by Kiawe and Turtonator's Z-Move, Inferno Overdrive. After seeing all of this, and receiving a Z-Ring from none other than Tapu Koko itself, he decides to stay with Professor Kukui and Rockruff while attending the Pokémon School. On Ash’s first day at school his new classmates give him some challenges before Tapu Koko showed itself which it takes Ash's hat before realizing it wanted to battle him and Pikachu. During the battle Tapu Koko helped Ash use the Z-Move Gigavolt Havoc with Pikachu but it shatter due to not doing the island trial which Tapu Koko left. When Ash's classmates explain the island trail Ash decided to do it to get another Z-Crystal with his classmate giving their full support for him. The next day, Professor Kukui gave him the Rotom Pokédex to get info on the Pokémon in the Alola region. When he tried to catch his first Alola region Pokémon, he gets a surprise attack by Team Rocket who tried to take Pikachu again but failed when the Bewear Ash saw when he was exploring on his first day at the region takes them away. Ash was able to catch his first Alola Pokémon, a Rowlet after befriending it when it got hungry and Rowlet wanting to be with him as well. Ash met Hala the Island Kakuna of Melemele island then he was there when he went to take the Island Trail and won when the Totem Pokémon Gumshoos gave him a Normalium Z-Crystal. Next came Ash's Grand Trial against Kahuna Hala through the hardwork of Rowlet and Pikachu, Ash won his Grand Trial. But as soon as he was going to take the Fightingium Z-Crystal as his reward Tapu Koko swapped it for the Electrium Z.
Ash catches Rockruff, the Pokémon Professor Kukui was taking care of, after helping it win a battle. Some time later Ash and Pikachu got challenged to another battle by Tapu Koko but the force of the battle caused Pikachu to fall off a cliff with Ash trying to save him but Tapu Koko saved them both with no winner. But declared that they would get stronger and win the next time they battle. Ash and Pikachu went to an island to spend time thogther during which they got to see Tapu Lele, the island guardian of Akala island. Then, Ash and his Pokémon come across Litten again this time find it with Stoutland in its new home to discover Stoutland is trying to teach it Fire Fang but with no success. Some time later, Litten finds Ash hoping he could help his ailing mentor, they make it to the Pokémon Center but only to find out Stoutland is nearing the end of its life and wonder if Litten knows. So Ash decides to keep them company to find out the pair is gone back to their home, then Litten discovers that Stoutland is gone and when Litten couldn't find his mentor anywhere he finally accepted Stoutland's passing. He finally agreed to his mentor's last wish and joined Ash's team making Litten his third Pokémon he caught in Alola region.
Ash came across Gladion, Lillie's brother, thus becoming rivals and good friends also through Gladion Ash learned along with deciding that he would take on Akala island Grand Trial to get Rockium Z so he can use Rock-type Z-Moves. Lucky for Ash, he was going on a field trip to Akala island with his classmates but before they did they meet Olivia, who's the island Kahuna for Akala island.
Ash then went with Mallow to collect cooking herbs when Totem Lurantis challenged him. Ash won and defeated Lurantis and received the Grassium Z and then ate dinner with his friends, Professor Kukui and Olivia.
After Ash got the Grassium Z, they challenged Kahuna Olivia with Rowlet and Rockruff while Olivia used Midday Lycanroc and Probopass. After defeating her, Ash received the Rockium Z so Rockruff could use Continental Crush.
At night, Rockruff ran off to train Ash found dust from Tapu Lele after Rockruff got away again then Ash and the co. went to find him with Professor Kukui and Olivia then Olivia and Gladion’s Lycanroc found it and dragged it to the Ruins of Life where Tapu Lele tried to heal but failed the first time. After Ash arrive along with his Pokémon, Professor Kukui and Olivia it used Drain Kissed on Ash and the two Lycanroc which helped heal Rockruff along with giving the energy back to them. Then Rockruff evolved into Dusk Lycanroc right before Ash and co. went back to Melemele Island with Professor Kukui.
Then the next day, Lycanroc and Ash were using the Rockium Z against Team Rocket, but when it failed to do so, Kiawe had to finish them off so then Ash and Lycanroc kept training. After Mimikyu's disguise broke and then Meowth and James found them again, they attacked back, but Ash tries the Rockium Z again and did it correctly.
Ash returns to Kanto with his classmates for an extracurricular lesson where he reunites with his long time friends, Misty and Brock. They head to Pallet Town where Ash reunites with some of his Pokémon under Professor Oak's care. After dealing with Team Rocket again along with falling asleep from Jigglypuff song they were treated to a welcome party with his mom there as well. The next day they headed off to the Cerulean Gym located in Cerulean City, where they got a chance to battle Misty or Brock. Ash decided to battle Misty in a one on one battle with Ash the winter of the battle then everyone headed back to Alola that evening also he tells Misty and Brock to come visit them sometime.
One night Ash has a dream where he promises the Legendary Pokémon Solgaleo and Lunala, but when he wakes up the next morning, he couldn't recall it. While heading to school, Ash and Pikachu saw Tapu Koko coming back as they follow it then saw an unknown Pokémon which helped him remember the promise he made to the Cosmic duo. Ash brought it to school to show everyone then Lillie nicknamed it Nebby with everyone liking the name and they all agreed to call it Nebby. After finding out what Nebby liked to eat which was star candies, with Sophocles help. Ash and Lillie were heading to Professor Kukui house where they see a helicopter on the beach as Professor Kukui explained that they have visitor who want to see them. Ash meets Lusamine, Lillie and Gladion mother, the president of the Aether Foundation along Professor Burnet, Wicke and Faba as they all came to meet Nebby. Ash shows Nebby to Lusamine who concludes that it's an Ultra Beast then Professor Burnet explains about the Ultra Beast and the battle they had with the Guardian deities. He tells them the dream he had that night about the promise he made to the Cosmic duo, after seeing an image of the Altar of the Sunne. Although Lusamine and Wicke offer to take care of Nebby but Ash decline due to his promise to take care of Nebby. Lillie and Professor Kukui assure Lusamine that Ash is a very trusting trainer as they tell her all the accomplishments he has done in Alola. Lusamine understands and trusts Ash to take care of Nebby also she offer to help if he needs it.
Ash has some awesome adventures with Nebby especially when it learned teleport as it teleported Ash and his friends to various places, minus Lillie. Then got to go to Aether Paradise with his friends which is where the Aether Foundation is located as he got to Lusamine, Wicke, Faba and Professor Burnet again.
Ash meets up with Gladion, by accident due to Nebby teleporting him to his location with Pikachu and Lycanroc, again where he meets his Type: Null, nicknamed Silvally. Ash tells Gladion that Lillie doing well also during the conversation Gladion explained why Lillie's afraid of touching Pokémon, due to an Ultra Beast attacking Lillie back when she was little, and his Silvally saved them. Ash wonders why Lillie never explained this but Gladion believes the trauma she suffered caused her to repress the memory of those events. Gladion wonders who Ash is, why the Cosmic duo chose him to take care of Nebby, about his Dusk Lycanroc, what powers does he possess and what kind of influences does he have on Pokémon. Although Ash doesn't have all the answer to Gladion questions but decided to have a battle, as Team Rocket interrupted before, as he believes this will help him answers his questions with him understanding the idea and accept his challenge. Ash with Lycanroc put up a good fight against Silvally but lost then Gladion understood more about Ash also he has him promise not to tell anyone he saw him also about Silvally especially Lillie which he understand and promises he won't say anything.
Ash is hanging with Professor Kukui and Professor Burnet, who came to give Nebby a check up, along with his Pokémon. Then Kiawe, Lana, Lillie, Mallow and Sophocles came over as they are having a sleep over at Professor Kukui house. Ash invited Professor Burnet to join them and she gladly accept as everyone gets settled in. Ash suggested having a contest to see who get to sleep in the loft, as Sophocles and the girls want to sleep up there, with finding Nebby being the contest. After the contest, with the girls being the winner due to Nebby pooping out of Lillie's hat and into her arm freezing her in fear, they play a game call Z-Posses one, two, three but Kiawe got carry away and used Inferno Overdrive messing up the place. While Ash, Mallow, Lillie and Professor Burnet make dinner while Professor Kukui has the rest help him clean up the place. Just when everyone was about to eat Professor Burent's Munchlax swoop in and ate everything promoting the two Professor to go out to get something to eat while the others wait. While waiting Ash and everyone decided to some training for Pokémon battle to help them forget how hungry they were. After eating they all talked about how amazing Professor Burnet is along with talking the about the homemade food at Kiawe and Sophocles place, right before going to sleep for the night. The next day everyone is walking along then everyone was stunned when Lillie could't touch Pokémon again even Snowy, as Nebby teleported her to Gladion location where she saw his Type: Null triggering a memory from her past.
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Alola Island Challenges
- Verdant Cavern Trial (Normalium Z)
- Melemele Island Grand Trial (Electrium Z)
- Brooklet Hill Trial (assisted Lana; did not receive Z-Crystal)
- Lush Jungle Trial (Grassium Z)
- Akala Island Grand Trial (Rockium Z)
- Thrifty Megamart Trial (did not receive Z-Crystal)
- Ula'ula Island Grand Trial (Lycanium Z)
- Unlike the previous anime series, Ash does not wear fingerless gloves with his outfit in Sun & Moon.
- With the capture of Litten, this is the second time since the Sinnoh region that Ash catches two out of the three starter Pokémon. Coincidentally like in Sinnoh, he catches Grass and Fire-type starters.