ther's only 4-7 island, and you can only get there by defeating the elite 4, and then go to cinnabar island. bill will be there, and will bring you to one island. You will meet a man, cleio, and you should help him get a ruby and saphirre, and maybe he'll give you a rainbow pass
On Seafoam Islands.
On Cinnabar Islands.
Seafoam Islands
There are 7 non-event islands.
I don't really know about Pokemon leafgreen, but in Pokemon red you can get it in seafoam islands. Hope this helps!
There are 2
1 islands
seafoam islands
In the Seafoam Islands
i think there are only 3 islands Acually there are 7 islands
Arcanine at level 48.
No, but you can catch some Johto Pokemon on the Sevii Islands.