you can buy them from a woman on the market district in slateport.
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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).
you can get it from somewhere....but you can also buy secret power (TM43) from the slateport market....the one on the right
tm43 in emerald is secret power
sinnoh Pokemon won't appear in Sapphire version!
The TM43 can be found at the Amity Square in Pokemon Platinum.