The Sevii Islands are part of an optional sidequest that gives the player access to capturing pokemon that normally dont appear in the Kanto map, also completing the Ruby quest on One Island will let you access islands 4-7, lastly finishing the Sapphire quest on Six Island will grant you the ability to trade between the Hoenn Pokemon Games (Ruby, Sapphire, Emerald) along with Pokemon Colosseum and XD Gale of Darkness.
Whirl islands are in the johto region which is not in firered.
Explore, catch pokemon, train your pokemon.
in 4-7 islands
seafoam islands
you cant
The Sevii Islands(islands 4,5,6,7)
Inside Seafoam Islands.
Seafoam islands.
They don't exist.
you get articuno in seafoam islands
no
Articuno is in the Seaform Islands