Cinnabar Island. To enter you have to find a key in the mansion nearby.
in the mansion.
On cinnibar island.
The key is in the Pokemon mansion.
Beat the seventh gymleader and when you come out of the gym a guy will give it to you
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
you must defeat the 5th gym and get surf in safaria zone the go to Pallet Town and surf downwards.
the seventh gym is the first gym at the begining of the game. the leader is giovani of team rocket. he's ground and normal type
its in cinnabar island, south of pallet town use surf to get there it is a fire gym
You will need to use the Secret Key which is hidden in the basement of Pokemon Mansion which is located on Cinnibar Island.
If you mean Pokemon FireRed/LeafGreen on the GBA, the mansion is in the top left corner of Cinnabar Island. (home of the seventh gym)
the seventh gym is at sekka city
In his gym