You cannot get to the island that is called Mirage Island in Pokémon FireRed. The island that is called Mirage Island was only created and can only be found in the Hoenn region and therefore can only be found in the games of Pokémon Ruby, Pokémon Sapphire and Pokémon Emerald.
There isn't Mirage Island in LeafGreen, only in Ruby/Sapphire and Emerald.
You need a full inventory of Pokemon to get to Mirage island. You Pokemon give a random number and if it matches with the old man who watches the island, then you can go to Mirage island. Mirage island will only be available for that day.
A Wynut, although you have to be VERY lucky for mirage island to appear and Wynut is the pre evolution of Wobbufet
You cannot get to Fire Island on Pokemon LeafGreen. Fire Island is a setting exclusive to the second Pokemon movie, Pokemon the Movie 2000.
Four Island is a location in Pokemon LeafGreen. To start the journey there, you need to have at least 60 different Pokemon.
One Island by Mt. Ember
Mirage island is not in Pokemon pearl.
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The only Pokemon on mirage island is wynaut
you'll need a Pokemon that knows surf and a Pokemon that is mirage island sensitive but you don't know which Pokemon are, it is random. you can find out by going to the man in pacifidlog who is searching for mirage island. if he can see it, you have a Pokemon that is mirage island sensitive
All the Pokemon if a man i can see mirage island take them
i don't know ,but i heard you have to get a mirage island compatible Pokemon
You need a full inventory of Pokemon to get to Mirage island. You Pokemon give a random number and if it matches with the old man who watches the island, then you can go to Mirage island. Mirage island will only be available for that day.
When you get to mirage island you will find ONLY wynauts.
A Wynut, although you have to be VERY lucky for mirage island to appear and Wynut is the pre evolution of Wobbufet
you find mirage island outside pacifidlog town when you have a mirage sensitive pokemon. you have to talk to an old man in the southeast corner of town without a hat. if he says "i can see mirage island today!" then then you have a mirage sensitive pokemon and can visit mirage island on route 130 or 129
Mew
You don't need any item, but mirage island is assigned a random # daily that coordinates with the # of one pokemon in the game, if you have that pokemon in your party with the corresponding # of mirage island, you can see it and travel to it.