The secret is the Pokemon unown.
At The power plant
In the secret house in the safari zone its in area 3.
The TM that contains Thunder is placed in the Power Plant.
He's(she's) in the power plant(level 50)
The secret is the Pokemon unown.
no
of course
Not in Pokemon leafgreen only in Pokemon Firered never ever in Pokemon leafgreen And in Pokemon firered it is rare in power plant not available in Pokemon leafgreen?
The Secret Key that you get in the Pokemon Mansion is used to enter the Cinnabar Gym.
At The power plant
On cinnabar island but you need to get the secret key in Pokemon mansion first.
to open the door of the 7th gym!
The secret key is hidden in the basement of Pokemon Mansion which is located on Cinnibar Island.
If you look carefully in the monean chamber and viapois chamber you can find a secret unown.
Nothing,stupid..........(= there is no secret its just there to trick you to search like crazy)=
At the power plant.