Yes you have to trade a Pokemon for the Larvitar with someone you know that has Pokemon version gold. The anser above is rong, you can't trade between gold and emereld. You need Fire red or leaf green, and another GBA and a link cable. Or you could just get a GameShark if you don't mind cheating.
You can't really...Well not unless you trade one from a Fire Red/Leaf Green or if you're using an Emulator stick one in the game with "Advanced Map"
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No you cannot catch Larvitar in Pokémon Emerald.
Larvitar cannot be obtained unless you trade it from leafgreen or firered.
Trade from Firered or Leafgreen.
Trading is required since it's not obtainable in the game.
Yes, but only through trading from Gold, Silver, Crystal, FireRed, LeafGreen, Diamond, Pearl, Platinum, HeartGold or SoulSilver.