encore does that your Pokemon have to use the move you last used, until it stands:encore fadded.
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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.