it is TM number 43
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In Slateport City (after you get the TM from the guy on that route), in the market place, a merchant will sell you the TM Secret Power and the TM Hidden Power.
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.
Get the TM secret power teach it to a Pokemon then find either a tree with vines, an indent in the wall or a big bush use secret power on these to create your own secret base.
I KNOW!You can buy it I think in the Lilycove Department Store...If not, I know for a fact you buy it somewhere...I know because I have four of the TM Secret Power and I taught it to Gardevoir and my Sudowoodo. Hope I helped :) you can also get it on route 111, theres a guy standing in front of a big tree who gives it to you.In slateport if you go to the lower left of town at the market place before the beach you can buy secret power from a lady there... it is TM 43. -hyak
NOWHERE.The TM trick is not available as a TM in Pokemon Emerald