The secret key is in the Pokemon mansion (Cinnabar Island) in the basement.
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The Secret Key that you get in the Pokemon Mansion is used to enter the Cinnabar Gym.
Find the secret key in the Pokemon Mansion,( Next to the gym)
just search for it ............or just go up until you found a table with the floor not broken and you will see a pokeball just get it that's the secret key!hope that help.The Secret Key is in the Pokemon Mansion on the Northwest end of Cinnabar Island.
You will find it in the Pokemon mansion on cinnabar 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.