in the meadow
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You can get him at the safari zone.
In HeartGold you can find Larvitar on Mt. Silver or in the Safari Zone (in the 'Mountain' area).Safari Zone
In the grass area
In the Safari zone, after getting National Dex. In the Flower Bed Area, with 10 forest blocks and 14 Rocky blocks in place. Then you wait 70 or more days.
In the Safari Zone after obtaining the National Dex. Or you could trade it from Pearl/Diamond/Platinum.