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
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.
Secret Power is TM 43 in Gen 3 and Gen 4.
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.
for your secret base you can make one by getting the TM secret power you can buy it in slateport city outside market
you cant you need to buy the TM or get it from the guy staring at the pine tree by the desert
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.
Go to route 112 (the route after exiting fiery path) then you will see a boy facing a pine tree. Talk to him and he will give you TM secret power.
Secret power is a move that you can use in and outside battle. You can use secret power to create bases in a indent in a wall a big bush or a big tree. You can also use it to attack Pokemon in battle.
To get hidden power go to Slaport City and ask one of the people who give stuff to you if you pay money and there are two choices TM hidden power or TM secret power
number 46
Secret power is a TM you can buy in the celadon dept store.
The TM secret power can be purchased at the slateport city outside market.