The 7th gymbadge is in Cinnabar Island
there is a key in the Pokemon mansion... you need it to get into the gym... search the Pokemon mansion thoroughly
Arcanine at level 48.
to open the door of the 7th gym!
You will find the key to the Gym of Cinnabar Island, From the Pokemon Mansion that is on the same island.
Get the 7th or 8th gym badge, and its in the Power Plant.
He will appear after you beat the 7th gym leader.
where artacuno is in leafgreen up the ladder.
Its inside a pokeball inside the Pokemon mansion on Cinnabar Island
First surf down from pallet town then go into Pokemon mansion and get the secret key then go into the 7th gym and beat blaine.
well first after you beat the 7th gym leader bill takes you there to the islands
read the question, "where is the 7th gym leader?" everything you need to know will be in there
The key is hidden in the basement of Pokemon Mansion which is located on Cinnibar Island.