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you need a Pokemon that knows secret power use that move to make your secret base
well they are secret bases but you need to teach one of ur Pokemon secret power(tm43), and u can get it in slateport city at the open market!(In Pokemon Sapphire).
in the secret citey mcors citey
some secret Pokemon aren't real like Freeza or Deserta thats just regirock and regice you can catch them by watching on youtube MunchingOranges' pokemon sapphire walkthrough but first you MUST POST HALL OF FAME :)
on sapphire/emerald this one boy gives you the move secret power. use it to make a secret base!
If you mean the 9 islands its in Firered or Leafgreen.
you can get it from somewhere....but you can also buy secret power (TM43) from the slateport market....the one on the right
You can go and buy it. Hidden power and secret power can be bought from a person (I don't remember where he/she is).
No there isn't. The cave is in Pokémon Emerald
you open them by teaching a pokemon secret power and then tap A next to the indent.
in Pokemon diamond and pearl just go on your udventure and you will find it but in Pokemon sapphire,ruby it's hard to get it
A person can read the braille in the Secret Chambers in Pokemon Sapphire by translating the braille to the corresponding letters of the alphabet. A person will be required to dig to reach the appropriate area of the chamber.