You can't 'catch' Venusaur. You can get Bulbasaur from Oak and evolve it twice, or you can do a trade. I know someone who knew how to catch other trainers pokemon, but I don't know how to perform it.
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you do not catch it . you can bulbasaur when you get it from proff oak
You can catch Lombre in Pokemon HeartGold in the Safari Zone at a waterside area once you receive the National Pokedex.
Find and then catch
You can't catch it. It's a starter pokemon.
you can catch a growlithe at route 37.