Delia, Misty, and Brock leave Ash behind in Pallet Town while they head to Seafoam Island for a vacation. When goes looking for them at Oak's lab, he learns that Professor Oak is trying to figure out the secrets of Slowpoke's evolution. Oak then suggests that Ash should go visit Professor Westwood, the creator of the Pokedex and find out. Ash heads out and surprises they other when he arrives. They head to Westwood's lab where they follow him around as he also studies Slowpoke. Meanwhile, Giovanni is tired of Team Rocket's failures and commands them to go and steal the Pokemon from Westwood's lab.