If you mean the Cinnabar gym (7) then you have to go to the end of the Pokemon Mansion where it is called the Secret Key. There are also the tms Blizzard and Solarbeam in there, and are well worth getting. If you want to get out quickly afterwards, bring an escape rope.
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It serves one purpose and that is to unlock the Cinnibar Island gym.
get the key in the od mansion on cinabargo to cinnibar island, then go in that place next to the gym and look for secret key. then get out and then you can go in the gym in cinabar island
I believe it is on Cinnabar Island. To enter the gym, you have to get through the Pokemon Mansion and find the secret key.
The 7th gym leader in fire red is Blaine in Cinnabar Island.To unlock The gym, u must go 2 the pokemon mansion,search the gym key in the basement.
The fourth gym at Pokemon fire red is grass type gym