Larvitar cannot be obtained unless you trade it from leafgreen or firered.
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No you cannot catch Larvitar in Pokémon Emerald.
Trade from Firered or Leafgreen.
Trading is required since it's not obtainable in the game.
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.