Katrina (カツコ Katsuko) is a character who made her first appearance in episode sixty-nine Lights, Camera, Quack-tion, in which she was the character of the day.
When Ash is looking for a place to train for the Pokémon League, he meets Katrina who then challenges him to a batte. Before the battle can commence, Team Rocket tries to steal Ash's Pikachu and Katrina's Raichu. After defeating them, Cleavon Schpielbunk appears and offers both Pokémon a role in his movie Pokémon in Love.
After the audition, Pikachu and Raichu both land roles in the movie as well as behind the scenes work to help create a thunderstorm. After the movie is over, Katrina and Ash express excitement at entering the Indigo Plateau Conference.