According to a tourist in one of the hotels in the game, the sixth gym leader, Valerie, is originally from Johto. Given how Valerie also wears a kimono and that her strongest Pokémon is Sylveon, a Pokémon which evolves from Eevee, it's possible that she is related to the Kimono Girls from Pokémon Gold, Silver, Crystal, HeartGold and SoulSilver versions. The Kimono Girls are a group from Ecruteak City in the Johto region who each specialise in Pokémon evolving from Eevee and are always seen wearing kimonos.