rainbow pass
If you mean the 9 islands its in Firered or Leafgreen.
go on the islands its on the fith one, near the cave
you cant go to johto but you could catch johto Pokemon on sevvi islands
go down and then left from fushia through the seafoam islands
You can't go to Hoenn on leafgreen, but after you beat the elite four you can trade with hoenn and go to the sevii islands. (all seven of them)
Go to vermilion city and go to the harbor show the sailor your tri pass to go to islands 1-3.
No You Can't. You can only explore around Kanto and The Nine Islands.
beet the elite 4 talk to celio and then you can go to all the islands
Not regions seen in other games, but you can visit some islands that are introduced in the FireRed and LeafGreen games.
Go into the Pokemon mansion and look around. At the end you will find the key to the door.
Only in firered and leafgreen can you venture to the sevii islands and four island.
when you talk to bill you can go to islands 1 2 and 3 on the same ship