How do you get the secret base?

Look for a large tree, bush, or indent in a cliff and use Secret Power (which can be found from the lad by the large tree north of the Desert and then from the Slateport Market, TM43). You may only have one Secret Base.

When you get TM43 (Secret Power) in Route 111 (near the old lady that heals your pokemon)...teach it to a Pokemon and use it in front of an indent, big tree or big bush.

You would then have a secret base free for you to decorate.

You use Secret Power where you are able to, and put decorations in it.

I forget the exact place but somewhere around the desert (not actully in the desert) a guy will give you the TM secret power.Teach it to a Pokemon and use it on a large tree or small indents in a wall.

Get the TM secret power, then go to a wall with a small indent in it.

If you mean the aqau hideout first you go to lilycove and go to the place where there is two grunts and they tell you their boss went somewhere. Then go to Slatport and find and talk to Captain Stern, he tells you of a recent discovery on the ocean floor of Route 128 next go to Mossdeep city and go to Steven`s house to get the HM.8 Dive. If you want you could go diving or you could go to route 128 and dive and go down the path under the water tell you see a square shape hole in a rock. Next go throw it and you will see a subarine and then click B. Naext it should say if you want to go up click yes and you will go up and find a shorelike place. Go throw the entrance (you will need strength and rock smash). Then go up and use rocksmash and push the boulder where you rock smashed.Then go all the way to the right and push a boulder to the right.then go up and face a trainer.then go to the left and you should see some stairs. Go up them and you should see another trainer. After you battle him/her go down and go through the doorway. Now go down and you should see two boulders and one smashable rock.Now push the farthest one to the top all the way to the right. Then there should be a rock right under you and push it down. Then go to the right and rock smash. Next go throw the tunnel and in the next room there is a ledge, jump over it. Then go to the right and there is another ledge, jump over it also.Next go up and threw another tunnel.Now there should be a boulder about two feet in front of you, psh it up un til it hits another boulder. Then go to the right and up. Then push it to the left. Now there is a boulder in front of you, push it up tell it hits a wall. Go to the closest tunnel now you are in a place were there is a lot of currents go through them tell you reach another part of land, go threw the tunnel above you. Now go all the way and you will see two trainers, verse them. Then go up threw the tunnel and there should tons of boulders. Get throw them but if you don`t make go threw a tunnel and come back in to retry. After you beat it go through the tunnel and you should be in a misty place and the rest is on your own.

You use Secret Power on a special place like a tree with vines hanging down.

Use secret power to make a place at a dent on the side of ledge, a hole giving access to the inside of big pile of grass, or to going high in a big tree.

Hi
Firstly you need the TM, secret power. You can get this from a guy who is directly north of Mavile(spelling) town, past the rocks and desert I think. He is standing next to a perticular looking tree. Talk to him and he will give you secret power, and you will also now be able to buy the move and the TM hidden power at the marketplace in slateport. Now that you have secret power, teach it to one of your Pokemon and when you click on the tree or ones like it, it will ask you if you want to make a secret base. You can also make secret bases in clumps of grass and indents in the wall.

Hope I helped

You need to get the TM that lets you use secret power so you can make a secret base.

Hope I help

Okay, first you need tm 43 "Secret Power". You can get this at thje market at slateport or near the old lady's rest stop. Next either stand next to a tree, indent on a wall or in front of a clump of bushes. Then get a Pokemon to use secret power and volia!! Hope I Helped!

You can make your own secret base but you should be more specific like Magma base or Aqua Base

You need a TM that lets you make a secret base.

Hope I help