Go to Rock Tunnel at Cerulean City(maybe I spelled it wrong) there would be a boy in there with the yellow hat will teach one of your Pokemon(you have to have a Pokemon that is a rock type)
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Rock Slide is taught by a move tutor in Rock Tunnel.
You need the mystic ticket to get to navel rock on firered.
Rock Slide: TM no.48 Effect: Deals non-contacting damage to the foe Pokemon. Has 30% chance to flinch the opposing Pokemon In Battle: Hurts both Pokemon in Double Battles Power: 75 Base Power (BP) Accuracy: 95% Type: Rock
Rock Slide is not a TM in Leafgreen. In Leafgreen Rock Slide is a Move Tutor move and the Move Tutor is hidden somewhere in Rock Tunnel.
Rock Climb is not a move in the game. It wasn't a move until Diamond/Pearl/Platinum, which came out after FireRed.