right at the end of the Pokemon mansion.
WARNING, there are strong Pokemon in there too especially the raticates and muks which can get to level 42.
you also find TM solarbeam over there, and dittos!(they are a type of Pokemon with a copy ability if you didnt know.)
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bottom floor of Pokemon Mansion
You need to acquire the Secret Key that can be found in the basement of the Pokémon Mansion and then you can use the Secret Key to enter into Blaine's Gym.
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.
You must enter the house above the lab then you look for the secret key. that unlocks the gym You must enter the house above the lab then you look for the secret key. that unlocks the 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