How To Enter Cinnabar Island Gym In Pokemon FireRed & Pokemon LeafGreen (The Pokemon Mansion) 

Where to get the Secret Key in Pokemon FireRed & LeafGreen.
Once you have the Secret Key you can get access to the Cinnabar Island Gym
To get the key to enter the Cinnabar island Gym you must make your way through the Pokemon Mansion and find the secret key.

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