You explore the mansion until you come to a room with two houseplants. There'll be a pokeball there. Pick it up. It's the key.
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it is on the B1 floor, on the table.
The 7th gym leader in fire red is Blaine in Cinnabar Island.To unlock The gym, u must go 2 the pokemon mansion,search the gym key in the basement.
You can find the key to unlock the door in Pokemon mansion
You have to go into Pokemon mansion. Find the key in the basement.
Well go to pallet town surf down and you'll reach a town with the next gym (fire type gym). The door will be locked but you get the key from the burnt mansion. Hope this helped.