you find the top floor, you press the switch, go into the hole and use your item finder i believe
deep inside it there is the key of 7th gym
the key is in the basement of the pokemon mansion
The key to the gym
there is a key in the Pokemon mansion... you need it to get into the gym... search the Pokemon mansion thoroughly
The secret key is in the Pokemon mansion (Cinnabar Island) in the basement.
the key is in the basement
The key is laying on a table in the deepest part of the Pokemon mansion. You can find it lying on the table and it's used for opening the gym.
It's located in the basement of the mansion.
in the bottom of the Pokemon mansion
In the house you jerk!
the basement
you have to get a key in the Pokemon mansion
That key unlocks the door to the cinnibar island gym.