Emerald's urinating habitEmerald seems to have an issue with his own height, as he wears his hair tall, clothing with extra long sleeves, and platform shoes. Much of his clothing appears to be intended to make him look taller than he really is. Even despite this, Emerald is much shorter than he already appears, as revealed by Greta and Todd while he is sleeping. Emerald doesn't like Pokémon themselves, but he likes Pokémon battles. To the amazement of Todd, he is an expert at battling. As he does not train his own Pokémon, he borrows the Pokémon he uses from Crystal.
Despite his protests, his Pokémon love him greatly and tend to get jealous of each other; his Sudowoodo and Sceptile even happened to get into an argument over Emerald's food and began cooking with Berries in a frenzy before being broken up by Emerald's Dusclops. His Sceptile's interest in Emerald's Pokédex indicated that it evolved from Wally's Grovyle. This was later confirmed.
Emerald carries several gadgets with him, primarily his extendable mechanical hands. He also has a pistol that shoots soil from various places around the world. By shooting a Pokémon with a "seal" of soil from its birthplace, the Pokémon is calmed by a sense of nostalgia.
Emerald has the ability to determine the birthplace of any Pokémon by sight. He uses this ability along with his gun to calm rampaging Pokémon that have been illegally added to the Battle Frontier, and has taken three of these cured Pokémon as his own.
He is small and has a green gem in his head. He has also golden yellow hair and many gadgets that make him taller.
When Emerald was still a child his parents died early and he was passed off to many relatives. But he always asks Pokémon for help when reaching for items. He mostly cares for Pokémon. But one day, other children bullied him stating that he depends on Pokémon too much. That's why he ran away from his house and from the Pokémon so that he can stop depending on them. He stated that he ran away from what he loved and cared the most, the Pokémon that helped him.
As revealed at the end of the Emerald chapter, Emerald was one of the orphans that Crystal was helping. He looked up to her and wanted a Pokédex of his own. Professor Oak did want to offer one to him at one point but he had declined due to his animosity towards Pokémon while in the Pokémon Academy. He spent his time roaming around Hoenn and met the Trick Master, who gave him the gadgets that were inspired by a faraway land. He also had a green gem that was used as a test to call out Rayquaza, but Emerald found the gem and it got attached to his forehead.
Emerald makes his first appearance when he arrives at the currently opening Battle Frontier, having been brought there by his two friends, Latios and Latias. He meets Todd, a news reporter, and saves him from a wild Sudowoodo that Todd had accidentally angered. He quickly runs off to go and challenge the Battle Frontier and gets into a brief tussle with one of the Frontier Brains, Tucker, and crashes the opening ceremony. After being captured by the angry Frontier Brains, Emerald reveals to them about his wanting to conquer the Battle Frontier. Initially, they refuse his challenge and decide to ban him from the Frontier until a news story reveals that the reporters thought that the Frontier Brains allowed Emerald to take part in the Battle Frontier. With the risk of losing major publicity, the Frontier Brains and Scott eventually agreed to his challenge: he would defeat all of the seven Brains within seven days.
Noland decides that he will be the first to challenge Emerald and the next day, Emerald begins his Battle Factory challenge. He manages to win 40 consecutive battles, allowing him to challenge Noland, the Factory Head. Despite having a team of random Pokémon, Emerald eventually manages to come out on top and wins the Knowledge Symbol. Later that night, Emerald reveals to Todd that he had taken the Sceptile he used to beat Noland, revealing that it is in fact, not a rental Pokémon.
Tucker and Brandon arrive to try to get Emerald to challenge their facilities next but end up getting into a fight that gets them stuck to one of the Battle Pike's fangs. The day after, Lucy finds, and frees the three from the Battle Pike's fang while telling Emerald to challenge her facility next. After getting three new Pokémon from his source, Emerald goes through the Battle Pike and its various traps ranging from wild Pokémon battles, to Status ailment inflicting Pokémon, to rooms that don't have any danger at all. Emerald manages to go through all 139 trap filled rooms and reaches the Frontier Brain, Pike Queen Lucy. The two battle each other; despite Lucy's strategy to poison Emerald's Pokémon, she is eventually defeated by his quick thinking. Emerald wins his second Frontier Symbol and goes to calm down the Pokémon he encountered in the Battle Pike, revealing that like his Sceptile, aren't actually Rental Pokémon and were planted there by someone.
Emerald and Todd are approached by Brandon who tells Emerald to challenge his facility next and throws him in the Battle Pyramid. Emerald picks a new set of Pokémon to use for his challenge and goes inside of the dark maze. He eventually manages to the peak of the Pyramid and begins his battle with Brandon and his legendary Regirock, Regice, and Registeel. Despite Brandon's powerful Pokémon, Emerald manages to defeat all of them and wins the Brave Symbol.
Just as Emerald leaves the Battle Pyramid he is ambushed by Anabel and the other Frontier Brains. The Brains believe that Emerald was the one who had stolen the Battle Factory's Rental Pokémon and attacked Noland. Emerald tries to prove his innocence by revealing why he came to the Battle Frontier, to capture the legendary wish granting Pokémon, Jirachi. Emerald, the Frontier Brains, and Todd all travel to the Artisan Cave where Jirachi is rumored to be resting. Emerald easily escapes the wild Smeargle that live in the cave and eventually finds Jirachi resting at the center of the cave. Just when he tries to capture Jirachi, Emerald is attacked by the armored Guile Hideout. Emerald and Anabel battle the mysterious villain while trying to capture Jirachi; in the end, Guile manages to stop them while Jirachi escapes.
The injured Emerald, Frontier Brains, and Todd all return to the Battle Frontier where Emerald starts his Battle Arena challenge. Emerald easily makes it through the Battle Arena and battles Greta in the final match and comes out the victor after doing something he’s never done before, cheering on his Pokémon, and wins Guts Symbol in the process. After he defeats Greta, Emerald and his Pokémon fall asleep and are taken into a hotel room by Greta and Todd. When Greta and Todd notice that Emerald’s clothes would be uncomfortable to sleep in, they decide to take them off and put him in a pair of pajamas. After they strip him down to his underwear, they are shocked to find out that Emerald is unusually short. Todd tells Greta to ignore this and sends her out of the room while Emerald’s Pokémon get into a fight over who gets to care for him while he sleeps.
The next day, Emerald decides to go to the Battle Dome as his next challenge and battles the many Trainers that have come to the Battle Frontier to take part in it. After taking a bathroom break, he meets Ruby and Sapphire, two other Pokédex holders from Hoenn. They reveal that they have come to help Emerald on his quest to find Jirachi but Emerald states that he doesn’t need help and attacks them. Later, at the Battle Dome, Emerald, Ruby, Sapphire, and Tucker all make it to the semi-finals of the tournament.
The first round of the semi-finals is Emerald facing off against Ruby, with the second being Tucker versus Sapphire. Ruby and Emerald battle each other and Ruby constantly annoys Emerald to the point of nausea by talking about the bonds he has with his Pokémon. Just when it seems like Ruby is going to win, Sceptile manages to finish off Ruby's Mimi, making Emerald the winner. The final match is Emerald versus Tucker (who had defeated Sapphire) but Emerald reveals that he wants to switch his team for a different one. Tucker gives him permission to do so and Emerald changes his team, stating that if he makes bonds with his Pokémon, then he is just insulting them. Emerald returns with a new set of Pokémon and battles against Tucker but is easily defeated by him.
A depressed Emerald walks out of the Battle Dome and immediately leaves to the Battle Palace, where he challenges Spenser for a match. Spenser explains that Emerald needs to pick three Pokémon he trusts the most and that they will battle without his commands. Emerald chooses Sceptile, Sudowoodo, and Dusclops, who he still has doubts about trusting. Just before they can even start the match, Spenser's phone rings with a message that reveals that Guile Hideout has captured Jirachi and is attacking the Battle Frontier with Rental Pokémon. Emerald decides to trust his Pokémon and leaves to the Battle Tower along with Ruby and Sapphire to defeat Guile once and for all.
The three meet up with Noland and go through the Battle Tower where they find Anabel, mind controlled by Guile Hideout. Emerald eventually makes it to the top of the Battle Tower where he faces Anabel and loses to her powerful Raikou. However, Latios arrives in the nick of time to return Emerald's Pokémon to him, along with the Spirits Symbol they won at the Battle Palace. Anabel collapses from not being able to handle the mind control and Latios and Latias use their power to reveal Guile Hideout’s true identity.
Guile manages to make his wish; a giant sea monster is created from the water surrounding the Battle Frontier and attacks the island. The Battle Tower's "Disaster Prevention System" activates and the Hoenn Pokédex holders begin fleeing. Emerald accidentally gets stuck in one of the doors and is surprisingly rescued by Guile Hideout; however, this Guile is quickly revealed to actually be Gold in disguise. Gold reveals that he and Crystal had come to help defeat Guile and free the Pokédex holders that were petrified at the end of the FireRed & LeafGreen chapter.
Gold gives Emerald the task of asking Jirachi for a wish to reverse the petrification of their senior Pokédex holders. Emerald attempts to get Jirachi to grant his wish but to no avail and becomes disheartened. Dejected, Emerald goes to train with Ruby and Sapphire to help his Sceptile learn the ultimate move, Frenzy Plant but is too depressed to focus. Emerald reveals his past to Ruby and Sapphire about how he obtained a Pokédex, got his mechanical suit, and how he got the mission to go to the Battle Frontier. Just as he finishes his story, their Pokémon finish learning the ultimate moves while Gold and Crystal fall on top of their training room, completely defeated by Guile.
Angered that Guile had hurt Crystal, Emerald attacks Guile but is easily sent flying by his sword. Guile taunts Emerald by stepping on his Pokémon; Emerald tries to get him to stop but Guile reminds him about his "liking Pokémon battles instead of the Pokémon themselves" philosophy. After hearing Guile insult his Pokémon and friends, Emerald angrily shouts that he truly does love Pokémon and the people who love them. His words cause Jirachi’s third eye to open and grant his wish to revive the petrified Pokédex holders. With their seniors revived, they join the fight against Guile and his army of Rental Pokémon. As they battle, Emerald comes up with a plan to defeat the giant Kyogre while Gold and Red manage to outsmart Guile and destroy his armor. After the plan is fully set up and Emerald successfully calming down the rampaging Rental Pokémon, the ten Pokédex holders have their Pokémon fire off the ultimate moves, Hydro Cannon, Blast Burn, Frenzy Plant, and Volt Tackle to finish off the giant sea beast, once and for all.
With the monster Kyogre finally defeated, Emerald fishes Guile out of the water and forces him to reveal where he got the armor. After explaining, Guile finds his armor floating in the water and breaks free of Emerald’s grip to try to get it back but only finds that it was the fake armor Gold had worn earlier. Guile then disappears in a bright flash of light, armor and all while Emerald falls asleep from exhaustion; Latios and Latias, finally happy that Emerald has found friends, say their goodbyes and leave to Southern Island.
Later that day, Emerald wakes up from his nap and finds that his Pokémon have bonded with the other Pokédex holder’s Pokémon. The Frontier Brains come and thank Emerald for his help and he is given the Ability Symbol by Anabel. Emerald and Todd quickly remember that there is only day left for his final challenge and they ask Tucker if he can schedule at tournament. Tucker explains that even though the Battle Dome was undamaged in the fight, there aren’t any people to hold a tournament; Red then comes up with the idea to host a Pokédex holder tournament, an idea Scott happily agrees to. Emerald is seen saying his goodbyes to Jirachi as it returns to its thousand year slumber once again. Emerald goes to battle in the tournament where it is shown that he managed to win the Tactics Symbol.
- Emerald is the 2nd male in the Pokémon Adventures series to have a girls name, along with Ruby and Pearl.
- He is the manga's 2nd original character, the first being Yellow.