When arriving at Driftveil Gym, Ash & Co. are soon sent to Milos Island by Clay in order to look for some Revival Herbs. However, when they arrive on the island, they learn that the plant isn't growing because someone has disturbed the shrines of the Pokémon that live on the island. Things get even more iffy when the legendary Pokémon: Tornadus and Thundurus appear and start attacking...

After the incident on Milos Island, Ash finally arrives at the Drifveil City Gym and Clay finally accepts his challenge. With Clay being a trainer since he was a child, Ash faces a massive challenge against Clay's Ground-type Pokémon. With Krokorok, Palpitoad and Excadrill being used by Clay, Ash soon learns that the battle is not as simple as using type advantages...