Mirage Island (Japanese: まぼろしじま Phantom Island) is an island in the Hoenn located on Route 130.
In the games
Mirage Island can be seen by the player when the personality value of one of the Pokémon of the player's team matches the random number between 0 and 65535 which is generated by the game every day.
A man in one of the houses in Pacifidlog Town alerts the player whether or not Mirage Island can be seen and if the player can go there.
Wynauts ranging from level 5 to 50 are the only inhabitants of the small island. The rare Liechi Berry can also be found in this island.
In the anime
In the episode Who, What, When, Where, Wynaut?, Ash and his companions get stuck on Mirage Island.
In the manga
In the Pokémon Adventures manga, Ruby and Sapphire trained on Mirage Island along with Juan, Tate, and Liza.