You can catch Larvitar at the Rock PokeSpot on Pokemon XD for the GameCube,You can trade it onto Sapphire after you've beated XD001 (Shadow Lugia)
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You can't, you either have to trade one from FireRed or LeafGreen, or trade the purified Tyranitar from Pokemon Colusseum and breed it.
I am guessing this means "Where is the Pokemon Larvitar?". You can find it in the tall grass on Route 207 using Pokemon radar. If you mean "What does Larvitar evolve into?", then it first evolves into Pupitar, then Tyranitar.
Rock Slide can only be learned naturally by some Pokemon in Sapphire (Sudowoodo, Slugma, Magcargo, Larvitar, Pupitar, Tyrannitar, Nosepass, Camerupt, and Solrock by level up; others can learn it through breeding) No TM or tutor is available
Larvitar cannot be obtained unless you trade it from leafgreen or firered.
Not naturally, no.