The Island of Illusions!

As Ash & Co. head to the next island, they soon find a large area of fog start to envelope the ship. They learn that the next island they're heading to is an island where loads of giant Pokémon used to live. As they enter the island, they soon sense something and spot a giant Heatmor, which attacks them. This leads them to more Pokémon which attack, but when they get to a Pokémon Centre, they soon learn that things are not what they seem on the island...