I'm the top student in the beginning class of the most exclusive club in the world, Pokémon Tech. It's sad that others aren't blessed with my beauty, my talent, my humble attitude. People call me a star, but I'm just Giselle.
Giselle appeared before Ash, Brock and Misty, making Brock and Ash blush at her appearance. Misty challenged her to a battle, as Giselle was arrogant and picked on Joe, her classmate. Though Misty lost, Ash challenged Giselle, using his Pikachu against her Cubone and won, using an unusual strategy. Though Team Rocket attempted to steal the Pokémon, Giselle ordered her classmates to battle, which got Team Rocket scared. Due to this experience, Giselle promised not to pick on Joe.
Cubone is the only one of Giselle's Pokémon that was actually shown. It is her loyal partner and her most powerful Pokémon. This Cubone seems to have the exact same personality as Giselle, strong and determined. It didn't even waste its time in attacking Ash's Pokémon, it just threw its bone at it. It's defeat came when Ash's Pokémon dodged the bone and it came straight back at Cubone, knocking it out.