From Bulbapedia, the community-driven Pokémon encyclopedia.
Mirage Island (Japanese: まぼろしじま Phantom Island) is a hard-to-reach location in Hoenn.
In the games
Mirage Island is found on Route 130 in Pokémon Ruby, Sapphire, and Emerald. However, it can only be visited under highly rare circumstances. It is visited mainly for the one Liechi Berry that it hosts.
Every day, two randomized bytes are generated by the game. If these bytes match the last two bytes of the personality value of any Pokémon in the player's party, Mirage Island will appear for that day as long as the matching Pokémon remains in the party. The bytes are generated once any button is pressed on the start menu and will last until the start menu is accessed again past 00:00 (midnight) of the next day. Even though play time has nothing to do with the real-time clock, a game that has reached the maximum time of play (999 hours and 59 minutes) will not generate Mirage Island numbers anymore—instead, the Mirage Island number will always be zero. Likewise, if a game is started while the internal battery is dead, the Mirage Island Bytes will be set to 0. However, if the game's real-time clock is not functioning (the internal battery has died) at any point before time of play reaches 999 hours 59 minutes, then the Mirage Island number will permanently stay at what value it was before.
Whenever "Mirage Island Bytes" are generated, they will not change within the time they are valid, and the player is able to freely move Pokémon from the boxes to the party or vice-versa until a Pokémon that has a matching personality value to the "Mirage Island Bytes" is found and the Mirage Island appears. This makes Mirage Island's appearance even rarer than encountering a Shiny Pokémon, although the probability of making it appear increases with the number of Pokémon the player has. The odds of a single Pokémon activating the Mirage Island is 1/65536; this chance is increased to approximately 1/10923 if the player has a full party.
A man in the North-Eastern hut in Pacifidlog Town will tell the player whether or not he can see Mirage Island each and every day, thus determining if the player can reach the location.
The island is inhabited by Wynaut which range from level 5 to level 50. It also bears a tree where one Liechi Berry can be picked. This is the best Berry for Pokéblocks, and will produce Gold Pokéblocks.
Route 130 with Mirage Island
Route 130 without Mirage Island
|| 5, 10, 15, 20, 25, 30, 35, 40, 45, 50
| A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
In the anime
Mirage Island in the anime
In Who, What, When, Where, Wynaut?, Ash, his friends, and Team Rocket landed on Mirage Island after Team Rocket's submarine exploded. May and Drew were stuck together and both ended up nearly drowning when Drew passed out, before being saved by the Wynaut.
While the island does appear on maps, the whirlpools around it make it almost impossible to get to or from the island.
In the manga
In the Pokémon Adventures manga
Wally rescues the man searching for Mirage Island on Pacifidlog Island from being washed away from Kyogre's storm.
Ruby and Sapphire were washed up on Mirage Island, after meeting up with Juan, Tate and Liza, Juan explains that the time in the island is different from the external world and they were unconscious in the island for twenty-one days. The time on the island does not always travel at a constant speed and when the time on the island goes normal, one can get on or off the island, so Juan carries a Sandshrew-shaped hourglass for this reason. Ruby and Sapphire meet up with Plusle and Minun for the second time and use them to practice Double Battles with Tate and Liza, preparing for the final battle against Kyogre and Groudon.
According to Juan, Mirage Island is not the actual name of the island; rather, this is what people call the island.
In other languages