You can find it at the Oreburgh gate and you will need rock smash and a bike to get it, and when you go down the steps it is in the top left corner of that room. I also recommend going back to the cave when you've got surf.
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brick break
Oreburgh Gate
You can get it in Icirrus City.
You can buy the TM brick break at the celadon dept store on the 2nd floor.
Simply put, you can't. Brick Break wasn't introduced until Gen. lll (Emerald, Sapphire and Ruby version).