You need the rainbow pass to get there. That means you must help Celio finish his machine.
There is no island 7 only 4,5,6
Four Island is a location in Pokemon LeafGreen. To start the journey there, you need to have at least 60 different Pokemon.
You will need to work your way to the basement in the Pokemon Mansion, you will then find the Key.
as of right now in present time its impossible you need cheats.
You need a special item from Nintendo to unlock the item to get to the island where you can catch it.
You need to Get a mystery gift
Four Island is a location in Pokemon LeafGreen. To start the journey there, you need to have at least 60 different Pokemon.
you need an arora ticket from a Pokemon event
On four Island you will need a Pokemon that knows Surf.
The sapphire is on Six Island. You need a Pokemon to use cut on the dotted door of the cave.
you need to defeat the elite four and catch sixty pokemon and go to one island's pokemon center and talk to bill's friend....
On cinnabar island but you need to get the secret key in Pokemon mansion first.
you need to get a auroa ticket and have 8 and 9 island oen
you need to migrate from emerald or firered/leafgreen where you can get him from birth island
it does but you need the aroura pass and you could only get that at a Pokemon convention and that was in 2004
You will need to work your way to the basement in the Pokemon Mansion, you will then find the Key.
Cinnabar Island, you need to surf South from Pallet Town.
She will be in Icefall cave on Four island you need the HM Waterfall to get to her.