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.
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Rock Climb is not a move in the game. It wasn't a move until Diamond/Pearl/Platinum, which came out after FireRed.
Use the HM move Strength.
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You have to defeat them.
You can use the move strength in Pokémon to move boulders. You can use strength in FireRed after getting the rainbow badge.