yeah, but first you need to beat the game and go to seven island.
(go look up the answers on how to get to seven island)
and it will be rare (took me 2 hrs)
it will be around lv (15-19 it evolves to pupitar at lv 30 then to tyranitar at lv 55)
just in case you were planning on evolving a tyranitar.
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Larvitar cannot be obtained unless you trade it from leafgreen or firered.
Trade from Firered or Leafgreen.
you can get the national dex from prof. birch after deafting the the elite four. then you can trade larvitar from leafgreen or firered. you can find larvitar in the seventh island in leafgreen/firered
Nowhere, because you can't find one in Emerald. You'll have to trade one from FireRed/LeafGreen.
You can't, you either have to trade one from FireRed or LeafGreen, or trade the purified Tyranitar from Pokemon Colusseum and breed it.