One island Pokemon centre after you defeat elite four and the 2 rockets at the volcano and find the gem.
You will find the key to the Gym of Cinnabar Island, From the Pokemon Mansion that is on the same island.
In Cinnabar Island, south of Pallet Town.
You can find the key to unlock the door in Pokemon mansion
Get the 7th badge from cinnibar island then you will see Bill outside of the gym say YES to his question to be transported to one island!
On Cinnabar Island.
beat the 7th badge, and you will be taken to it
You will find the key to the Gym of Cinnabar Island, From the Pokemon Mansion that is on the same island.
In Cinnabar Island, south of Pallet Town.
You can find the key to unlock the door in Pokemon mansion
Get the 7th badge from cinnibar island then you will see Bill outside of the gym say YES to his question to be transported to one island!
The 7th gym leader is Blaine. He the gym leader of Cinnabar Island gym. He uses Fire type Pokemon and he will give you the TM that contains Fire Blast when you defeat him.
The 7th gymbadge is in Cinnabar Island
you have to go into the pokemon mansion on cinnabar island and navigate your way around there untill you find the key
On Cinnabar Island.
Yea there is the island with the 7th gym on it is an island.
mahogany town it is an ice gym or if you mean in kanto it seafoam island and it blanie fire type gym
he is in both... you find him at cinnabar island but first u have to go to sea foam island to defeat the 7th gym leader in the kanto region