Mirage Island
Mirage Island is a "magical" island at the end of Route 130 that is normally invisible. It is inhabited by many Wynauts (low and high leveled ones) on it you can also find the rarest in-game berry, Liechi berry. The game generates a random number daily (probably even if you access Lanette's Computer) and if this number matches the personality number of one of your Pokémon, then the island appears. There have been rumours that only female Pokémon can make Mirage Island appear but that is false. The best way to check if you can see Mirage Island is to ask the old man that lives in the south-east of Pacifidlog Town. If the Mirage Island can be seen that day he'll say "Oh! Oh my! I can see MIRAGE ISLAND today!" otherwise he will say "I can't see MIRAGE ISLAND today…". Since there are 4.294.967.295 different personality numbers, you have, 4.294.967.295 divided by the number of Pokémon you own, chances. Below you can see some screenshots of Mirage Island.
