Kay
Kay (Japanese: ケイ Kei) is a one-time character in the Pokémon anime who appeared in Stage Fight. Her English voice actress is Jessica Calvello and her Japanese voice actress is かかずゆみ Yumi Kakazu.
Kay was a member of the Pokémon Showboat, a group of performers who provide voices of Pokémon while the Pokémon act in a show. While all of the other actors in the show got along with their Pokémon, Kay didn't get along with her Raichu.
She revealed to Ash that the reason she and Raichu didn't like each other is because of something that happened when they first met. Raichu was so happy, it jumped into Kay's arms and used Thundershock. Frightened, Kay accidentally threw Raichu, and the Pokémon became frightened of her.
Kay and Raichu finally gained each others trust during a battle with Team Rocket. Kay, providing Raichu's "voice," was able to distract Team Rocket and send them blasting off.
