"Hello! Welcome to the Pokémon League! I'm Aaron of the Elite Four. It's good to meet you. Oh, I should explain, I'm a huge fan of bug Pokémon. Bug Pokémon are nasty-mean, and yet they're beautiful, too... Would you like to know why I take on challengers here, in this room? It's because I want to become perfect, just like my bug Pokémon! Ok! Let me take you on!"
When last Pokémon is at critical health
"Not yet! Your first Pokémon League victory doesn't come easily, kid."DP
"It's not over yet! A League Elite Four can't give up!"Pt
"I will now concede defeat. But I think you came to see how great Bug-type Pokémon can be. I hope you also realized why you're up against in the Pokémon League. Battling is a deep and complex affair..."
After being defeated
"I lost with the most beautiful and toughest of the bug Pokémon... We lost because I wasn't good enough... That's it! Back to training camp! Let's hear it for me! No... That was wrong... Anyway... Go on to the next room! Three Trainers are waiting for you. They are all tougher than me."
"Go on, go to the next room. I'm going to become a top-level Trainer who can't be outclassed with my beautiful and tough bug Pokémon!"
Ash and his friends decided to go watch Aaron train and joined the long line of fans that were there to meet him, with Dawn getting her copy of Poké Chic signed by him. When Aaron found out that the group knows Cynthia personally, he took them to his training center. There, he revealed that a Wurmple was his first Pokémon and close friend when he was young, but due to his anger at it for losing a match, he abandoned it. He regretted it later, and from then on, he tried his best to train hard and to understand Bug-typePokémon so that the same incident would not happen again. Aaron eventually encountered Wurmple again as a Beautifly by the end of the episode, following a battle against Team Rocket.
Aaron first encountered his Beautifly as a Wurmple when it helped him down from a high tree. They became very close friends, but finally Aaron became irritated that it always lost and left it behind. When he later returned to the place where they had seen for the last time, Wurmple was gone.
The same Wurmple returned in A Trainer and Child Reunion!, now having evolved into a Beautifly. The meeting place was just besides the very same tree where they had first met. It told how after Aaron had abandoned it, it had started training by itself. Beautifly helped Ash and company along with Aaron to get rid of Team Rocket that had tried to steal Aaron's Pokémon. After this Aaron took Beautifly back to his team.
There's not much known about Aaron's Skorupi as it has never been seen battling, but like all of Aaron's Pokémon, it seems to be a very good friend with him. Aaron usually seems to keep Skorupi out of its Poké Ball, and lets it follow him or ride on his shoulder.
The first time Drapion was seen was when Aaron was demonstrating his Pokémon's powers before his battle with Cynthia. When Drapion got caught by Team Rocket along with Aaron's other Pokémon, it went against Jessie's Seviper, but got badly hurt from Seviper's Poison Tail. Later it was however able to defeat Seviper with a Hyper Beam.
During Aaron's battle against Cynthia, Drapion was sent out to face Cynthia's Garchomp, but was defeated off-screen.
Aaron used Vespiquen along with his Drapion during his power demonstration. When captured by Team Rocket, she got hurt badly by James's Carnivine's Bullet Seed, but was later able to defeat it with a Slash.
Aaron appears in the chapter Clefairy's Pokémon Center is Super Useful!? of the Pocket Monsters DP manga. He is seen taking his Stunky to a Pokémon which Red and Clefairy becomes in charge of. He reads a book while waiting for Stunky to feel better. However, the treatment Clefairy gave it was ruined by Stunky falling into the treatment machine and this failure made Stunky's condition worse. Aaron didn't like what Clefairy did after finding out about this. After Stunky used Poison Gas on Red, his Pokémon, and Professor Oak, both Aaron and Stunky leave the Pokémon Center.
Stunky was injured during its debut in which Aaron takes it to a Pokémon Center in which Red and Clefairy were running at the time. Clefairy takes care of it by putting it down on a machine. Stunky accidentally falls inside which ruined the treatment and Stunky became worse than before. Aaron didn't like what Clefairy did and ran off with Stunky after Stunky used Poison Gas on Red, his Pokémon, and Professor Oak.
Aaron's Pokémon Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.