No, the Sevii islands don't have any gyms. The Sevii Islands act as a sidequest - something to do in between defeating the main gyms, which are located in the same areas as Red/Blue/Yellow.
Beat the elite four.
yes
It lets you travel to all of the Sevii Islands.
If you are on the Sevii Islands, go to a boating dock, talk to the man by the boat, and select Vermilion City to get back to the original map.
You don't. The closest thing to the johto region in FireRed AND LeafGreen are the Sevii Islands. You don't. The closest thing to the johto region in FireRed AND LeafGreen are the Sevii Islands.
you have to beat 6 gyms
Suicune is not in the Sevii Islands.
The Sevii Islands are a fictional archipelago of nine large islands and several small islands surrounding them. They are far south of Kanto, and are home to several legendary Pokemon. They appear in Pokemon LeafGreen and FireRed, and peripherally in Pokemon Emerald.
The Sevii Islands(islands 4,5,6,7)
yes
Beat the elite four.
No there is not you can only be in kanto or the sevii islands
The Sevii Islands aren't in the game at all, so AR codes would do nothing.
Nope
You get it at Ember Spa in the sevii islands
It lets you travel to all of the Sevii Islands.
Mt. Ember in the Sevii Islands.