You get it when you battle your dad which is the fifth gym
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NOWHERE.The TM trick is not available as a TM in Pokemon Emerald
Defeat your dad at Petalburg gym and he gives you the Facade TM, should be the same with sapphire and emerald
Tm. 35
TM 42 is Facade in Pokemon Fire Red, Leaf Green, Sapphire, Ruby and Emerald. Facade has a base attack power of 70 with 100 accuracy and 20 PP and when the Pokemon using that move is either Paralyzed, Burned or Poisoned the strength of Facade doubles to 140.
It's on Six Island in that cave with the Braille.