Hearing about Treasure Island from his classmates, Ash & Pikachu head to the island to explore. While there, it's the first time Ash & Pikachu have been out adventuring alone in a very long time and so they begin to strengthen their bond. However, before too long, a mysterious Pokémon appears overhead...

While training, Ash discovers a mysterious shovel moving aronud in the sand. Learning that it's a Pokémon called Sandygast, Ash learns of the dangers in touching the shovel. However, Sandygast's shovel flies off and angers tha Sandygast. Will Ash be able to help it?