From Bulbapedia, the community-driven Pokémon encyclopedia.
Anita (Japanese: アザミ Azami) is a character of the day who appeared in the episode Gonna Rule the School!.
Before, she felt that going to the Trainer's School is something that they have to do because their parents told them to do so. She felt the same way as Kenny did. But after seeing Max and Tommy help save some stolen Pokémon from Team Rocket, her views about Pokémon changed.
Apparently, at first she disliked Tommy because he prided himself on being the star student and she was tired of all of his bragging. However, her opinion changed when she saw that Tommy had a nicer side.