From Bulbapedia, the community-driven Pokémon encyclopedia.
A Frontier Brain (Japanese: フロンティアブレーン Frontier Brain) is a Pokémon Trainer who presides over a certain Battle Frontier facility. Frontier Brains appear in Emerald, Platinum, HeartGold and SoulSilver. Those from Hoenn hand out Symbols to Trainers who rise through the ranks and show true skill in each of the facilities, while those from Sinnoh and Johto hand out commemorative prints for the same reason.
Hoenn Frontier Brains
Sinnoh/Johto Frontier Brains
In the anime
The Generation III Frontier Brains in the anime
The Frontier Brains were first mentioned by Scott in The Scheme Team when he told Ash about the Battle Frontier. The first Frontier Brain, Noland, debuted in Numero Uno Articuno. Over the course of the ninth season, the other six Generation III Frontier Brains also made their appearances at their respective facilities. Brandon reappeared in Pokémon the Series: Diamond and Pearl episodes A Pyramiding Rage! and Pillars of Friendship!. Scott also inferred that they were at least at the level of the Elite Four member Agatha, as both he and Agatha recommended that Ash challenge them shortly after his fight with her.
Palmer is the only Generation IV Frontier Brain to have appeared in the anime, debuting in Historical Mystery Tour!. In the next episode, Ash battled Palmer at the Twinleaf Festival, but was defeated. Palmer also made cameo appearances in Arceus and the Jewel of Life and Zoroark: Master of Illusions. Caitlin, the employer of Castle Valet Darach who oversees all of the battles conducted at the Battle Castle in the Generation IV games, appeared in Jostling for the Junior Cup! as a member of the Unova Elite Four, facing off against Cynthia in an exhibition match at the start of the Pokémon World Tournament Junior Cup.
In the manga
The Hoenn Frontier Brains in the Pokémon Adventures manga
In the Pokémon Adventures manga
The Hoenn Frontier Brains were important characters in the Emerald chapter, where they were challenged by Emerald in a seven-day challenge to defeat each of them at their own facilities. They also helped to fight against the armored villain named Guile Hideout, who was after the Mythical Wish Pokémon, Jirachi. They reappeared in the Omega Ruby & Alpha Sapphire chapter, helping to stop the Admins of Neo Team Aqua and Neo Team Magma.
The Sinnoh Frontier Brains appeared in the Platinum chapter, where each of them, save Palmer, were challenged by Platinum. While Palmer was not battled by Platinum, he assisted the Sinnoh Pokédex holders and the Stat Trainers in the final battle against Team Galactic in the Distortion World.
In the Pokémon Battle Frontier manga
Enta battled each of the seven Frontier Brains in the Battle Frontier manga, although his battles with Noland, Greta, and Brandon occurred off-panel. He managed to defeat six of them, but eventually tied with Anabel.
In the Pokémon Diamond and Pearl Adventure! manga
Palmer is the only Frontier Brain to appear in the Pokémon Diamond and Pearl Adventure! manga, debuting in Look for Giratina!, where he was encountered by Hareta, Mitsumi, and Jun at the Fight Area.
In other languages