Yes. Go to the market in Slateport and talk to the lady under the tent on the right side. Then buy TM 43. That is Secret Power.
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You can buy it from a man in Slateport Market. He also sells Hidden Power.
no, you use secret power on it then it makes a base.
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.
Go above Mauville and past the desert till you find a different looking tree with a man standing in front of it. Go talk to him and he will give secret power to you.
it is a item you can put in your secret base