If you look carefully in the monean chamber and viapois chamber you can find a secret unown.
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Go into the tanoby chambers to catch the Pokemon unown.
Unown is a very common Pokemon that can be found in Dilford Chamber, Liptoo Chamber, Monean Chamber, Rixy Chamber, Scufib Chamber, Viapolis Chamber, and Weepth Chamber.
of course
Nothing happens, except the fact that you have many Unowns. ~Katie
The Secret Key that you get in the Pokemon Mansion is used to enter the Cinnabar Gym.