Umm, I presume you're talking about Misty, but next time be more clear, okay?
By the way, you could have posted this in your other topic, instead of making a seperate one, but oh well.
*Spoiler Alert*
Misty's Poliwhirl evolves into Politoed, so I hope she'll bring Horsea (her favorite), Corsola, and Politoed. Of course, I believe Psyduck will tag along no matter what. She'll probably tell Staryu, Starmie, and Goldeen to watch after Togepi at the gym.