you must have given the ruby to celio on island one he will give you rainbow pass which lets you go to islands 4-7.
To go to island 5 you must first obtain a special event so i am sorry as they no longer give it out.:(
you have to get a rainbow pass
You have to have your first Pokemon in your party to like you fully, then go talk to the dude that has the egg then he will give it to you(if your first Pokemon in your party likes you fully)
Only firered can capture qwilfish trade one from firered to leafgreen.
On cinnabar Island, to the left of the pokemon center, lies a "laboratory". If you go inside, then go to the right and enter the third door. Talk to the Professor there.
Team rocket will go to the dotted hole after five island in leafgreen, but I'm not sure about firered.
go to five island, then surf up to the rezort. then surf right.
go to five island/ to the rocket wearhouse and if u have both passwords you will be able to go in
you go to an island and it is there. i think it is the 8th island.
Cinnabar island
To go to island 5 you must first obtain a special event so i am sorry as they no longer give it out.:(
Go to Vermilion and get on one of the many Seagallop boats (I think there are 10) and go to the item on the menu that says "Other" there you will find Five Island.
The Pokemon day care for Pokemon Leafgreen/Firered is on island 4. You have to beat the elite 4 and get the machine on island 1 working to go there.
If you are going after the Sapphire, then you go to Five Island and run through the Rocket Warehouse to get the Sapphire.
In lost cave which is located at five island go north to resort gorgeous then go east to find the cave.
Go to birth island.
you have to get a rainbow pass