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.
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The secret key is in the Pokemon mansion (Cinnabar Island) in the basement.
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 Secret Key that you get in the Pokemon Mansion is used to enter the Cinnabar 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
if you got it from the Pokemon mansion it opens the cinabar Pokemon gym