Rebecca was first seen watching the battle on the road between Anthony's Hitmonchan and Pikachu. After the battle she introduced herself to Ash and his friends and told them that her father Anthony
's holed himself up in the mountains and wouldn't come home at all despite the pleading from her. Ash Ketchum
agreed to enter the tournament in order to beat Anthony
so that he'd come to his senses and return home to his family.
In the P-1 Grand Prix tournament, Rebecca
sat in the stands with Misty
as they watched all the fights hoping that her father would loose. After loosing, Anthony
asked his daughter Rebecca
to forgive him for worrying so much and they quickly made up. Thankful for Ash Ketchum
's help, she waved goodbye to Ash Ketchum
and his friends after Ash Ketchum
released his Primeape to her father.