From Bulbapedia, the community-driven Pokémon encyclopedia.
Katrina (Japanese: カツコ Katsuko) is a character of the day in the episode Lights, Camera, Quack-tion.
While Ash was looking for a place to train for the Pokémon League, he met Katrina, who challenged him to a battle. However, before it could even begin, Team Rocket tried to steal Pikachu, but they ended up stealing Katrina's Raichu instead. After quickly defeating them, Cleavon Schpielbunk appeared and offered both Pokémon a role in his movie, Pokémon in Love.
When filming was completed, both Katrina and Ash expressed excitement at entering the Indigo Plateau Conference.
This listing is of Katrina's known Pokémon: