you can not get Growdon on heartgold but Ruby and the 2 games that go with it you get at a cave in the city that has the 8th gym leder
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You can catch Lombre in Pokemon HeartGold in the Safari Zone at a waterside area once you receive the National Pokedex.
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You can't catch it. It's a starter pokemon.
you do not catch it . you can bulbasaur when you get it from proff oak
you can catch a growlithe at route 37.