A room full of money
That key unlocks the door to the cinnibar island gym.
The key is in the Pokemon mansion.
What is the city cent door
You have to get the key in a mansion You have to get the key in a mansion
You can find the key to unlock the door in Pokemon mansion
go tho the big mansion the find the key thare
its in the Pokemon mansion behind the lab on cinnibar island
check the game guide on IGN...........its on the course Big Boo's Haunt :P
you have to work your way through the Pokemon mansion and go out the right door while using the correct switches its and the very end of the Pokemon mansion
The gym is locked to make the game a little more challenging the key is in the Pokemon mansion which is near the gym.
You need the secret key found in Pokemon mansion.
the key is in the basement of the pokemon mansion