On the road back to New Bark Town, Ash and friends stop for a rest near the ocean. There they spot a sign advertising a synchronized Pokémon swimming event. Close behind is Team Rocket, who quickly hatch a plan to steal all of the Pokémon from the swimming show.

Ash receives an egg from Prof. Elm, and as the egg hatches into a Larvitar, Ash must help the shy pokemon find its parents. Unfortunately, Team Rocket has their eye on this rare pokemon.