You can get an action breplay and download the code for it.
You cannot get to island 8 without cheats
You need a special item from Nintendo to unlock the item to get to the island where you can catch it.
With a special password you find somewhere in the game
You cannot get to Fire Island on Pokemon LeafGreen. Fire Island is a setting exclusive to the second Pokemon movie, Pokemon the Movie 2000.
there is no cinnabar island in sapphire. cinnabar is on firered and leafgreen. also in Pokemon yellow special pikachu edition ^_^ don't forget that dude...
mew is on island 9
Four Island is a location in Pokemon LeafGreen. To start the journey there, you need to have at least 60 different Pokemon.
on cinnabar island
on cinnabarb island
4 island.
Cinnabar Island
Go to 8 or 9 island. It is unlocked by a special event that doesn't happen anymore.