When does mirage island appear in Pokemon emerald?

Answer 1

Mirage Island is found on Route 130 in Pokémon Ruby, Sapphire, and Emerald. However, it can only be visited under highly rare circumstances. Every day, a random number between 0 and 65535 in hex (that is between 0x0000 and 0xFFFF) is generated by the game. If this number matches the last two bytes of the personality value of any of the Pokémon in the party in hex, Mirage Island will appear for that day. The number is generated at 0:00 hours every day and it is active 24 hours. 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. Whenever a Mirage Island number is generated, it will not change within the time it is valid, and the player is able to freely move Pokémon from the boxes to the party or vice-versa until the Pokémon that has the same personality value as the 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.