From Bulbapedia, the community-driven Pokémon encyclopedia.
Rebecca (Japanese: レベッカ Rebecca) is a character of the day who appeared in Double-Time Battle Training!.
Rebecca is a Pokémon Coordinator who competed in the Brussel Town Contest with her Shuckle. She made it all the way to the final round but lost against Zoey and her Glameow.
This win against Rebecca gave Zoey her fifth and final Ribbon which qualified her to compete in the Sinnoh Grand Festival.