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The name currently in use is a fan designator; see below for more information.
The Deserted Island (Japanese: 無人島 Deserted Island) is the twelfth island that Ash and his friends visited during their travels on the Decolore Islands. It was featured in Mystery on a Deserted Island!. The island is rumoured to have been a hideout for a pirate.
The mountaintop containing the hidden treasure
The group rented a boat from neighboring Frond Island after learning about an old pirate story from Alexa, they later arrived on this island to go treasure hunting. The group stumbled across an abandoned ship and a secret door. Cilan deciphered the code and they entered in the as of yet undiscovered part of the island. While there, they got attacked by some wild Pokémon which Ash and Iris fended off with their Pokémon. The group then befriended three Eevee.
Team Rocket were also on the island and, using their Woobat and Yamask, they tried to fend off the Pokémon that attacked them. Alexa figured out that the Pokémon on the island are ones that evolve from stones. Cilan suggested that they should go to the deepest part of the island as they would find the stones there. This lead them up a mountain, which featured five mysterious stone statues arranged in a star shape. After getting attacked by a Ninetales, the group found a secret passage that led them to a treasure chest which contained Evolution stones. The three Eevee they befriended evolved and the Pokémon on the island started to respect the group. With the task accomplished, the group left the island as they said their farewells.
Pokémon seen on the island