Enroute to Saffron City, Ash & Co. meet up with a professor who has been studying a Caterpie and it's evolutions, however in his experiments he has made the Caterpie and thus it's evolutions, giant sized. Team Rocket however have snuck in and decided to make their Pokémon increase in size to steal Pokémon. Will they succeed?

It's time for the Saffron City Pokémon Contest. May is entering with her Squirtle & Combusken, Harley is entering with Cacturne & Ariados and Jessie is entering with Cacnea. The battles will be tough but will May be able to beat Harley and earn her first Kanto Ribbon?