Caitlin

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Caitlin was originally a Frontier Brains in the Sinnoh region Battle Frontier with her friend Darach. However, Caitlin would eventually return to her region and become one of the Elite Four in the Unova region. Despite her gentle and calm appearance, Caitlin is a powerful psychic trainer who's capable of holding her own in a Pokémon battle.

Greta

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Greta is one of the Battle Frontier Brains who is known for her expertise in Fighting-type Pokémon's. Out of all the Frontier Brains, Greta issaid to be the most energetic when battling other trainers. Known for her high-spirited personality during Pokémon battles, Greta will often try to push her opponents to enjoy pokemon battles as much as she does.