Find the secret key in the Pokemon Mansion,( Next to the gym)
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You will find it in the Pokemon mansion on cinnabar island.
The Cinnabar gym key is in the abandoned mansion west of the gym. Spray on a super repel and get to work!
you have to find it inside the Pokemon mansion located on cinnabar island
You must continue going to the far right of cinnabar while surfing into a cave, there you will have to search and then youl find a key there
On Cinnabar Island.