the secrt is if you get all of the signs you get a dioxis after going to elite four 10 times
it is unknown
The secret is the Pokemon unown.
no
of course
In Liptoo Chamber.
Nothing just to collect them.
Secret power is a TM you can buy in the celadon dept store.
The Secret Key that you get in the Pokemon Mansion is used to enter the Cinnabar Gym.
the sleeping Pokemon is unknown. you get it by doing the boulder puzzle in sevault canyon.
the unknown Pokemon are for Pokemon you train them and collect them, no matter what other people say like getting the mystic ticket or anything else is all lies
On cinnabar island but you need to get the secret key in Pokemon mansion first.
to open the door of the 7th gym!