you can get it from somewhere....but you can also buy secret power (TM43) from the slateport market....the one on the right
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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).
If you go through the dessert in Pokemon emerald, Sapphire, or ruby, you'll see a boy standing next to a tree. Talk to him and he'll give you the TM Secret Power.
firstly use cut then by using secret power (its a TM)
If you have or have taught a pokemon the move Secret Power, you can use it on those vine trees, notches in cave walls, and big bushes to turn them into a secret base.
Stand at the front of the clump of grass and press A but you must have a Pokemon with you that knows the move secret power and it should ask you if you want to create a secret base there. Hope it helps :)