You have to go into the pokemon mansion, find your way through it, and pull a switch and the gym will open.
The seventh gym is on Cinnabar island,right down of pallet town.To open the doors you must reach to a certain room of the Pokemon mansion.You get a key and open the seventh gyms doors,and the gym is a fire gym
To open the Elite Four, you have to get all the Gym badges.
In Pokemon FireRed and LeafGreen you can't open a gym.
to open the door of the 7th gym!
Open the door and challenge the gym leader.
It's in Cinnabar island. It's where you get the key to open the Gym #7
You will find the key to the Gym of Cinnabar Island, From the Pokemon Mansion that is on the same island.
You need the secret key which is found in Pokemon mansion which is also on cinnibar island.
You have to win all of the other gyms then go right into it and the doors are open
The key to the gym
its in cinnabar island, south of pallet town use surf to get there it is a fire gym
You would basically need to know about Pokemon to take the quiz then just use mainly water type Pokemon.