It serves one purpose and that is to unlock the Cinnibar Island gym.
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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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I believe it is on Cinnabar Island. To enter the gym, you have to get through the Pokemon Mansion and find the secret key.
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
You can find the Lift Key in the Team Rocket Hideout on Pokemon FireRed. It is dropped by a Grunt on basement floor 4 after defeating him.