in the mansion.
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The Secret Key that you get in the Pokemon Mansion is used to enter the Cinnabar Gym.
You will find the key to the Gym of Cinnabar Island, From the Pokemon Mansion that is on the same island.
You have to find the key in the abandoned mansion.
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
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.