At the police station, Jenny explains that the group of Squirtle are called the Squirtle Squad. She feels sympathy for them, as they were abandoned by their Trainers, and all they do is run wild and play pranks on everyone. Meanwhile, Team Rocket is accosted by the Squirtle Squad, tied to a tree, and all of their food is stolen and eaten. Taking advantage of the Squirtle’s mistrust of humans, Meowth tricks them into helping him with Team Rocket’s latest plan to finally steal Pikachu. Elsewhere, Misty is fishing while Ash and Brock lie on the riverbank. One of the Squirtle Squad members pops up and soaks them with a Water Gun. Ash, tired of the Squirtle Squad’s antics, confronts the Squirtle when it jumps out of the water. Pikachu charges to attack, but the Squirtle withdraws into its shell and tackles him, knocking Pikachu into the water, where it is attacked by a wild Goldeen.
(Source: Bulbapedia)