headbutt certain trees in mt.silver and I think on route 28.
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You can get natu at the ruins of alph in heart gold and soul silver
Level 30.
You cannot catch Natu in Pokemon Black. You will have to trade for one or transfer one from a DS Series game.
They swarm occasionally on route 224
You can catch Lombre in Pokemon HeartGold in the Safari Zone at a waterside area once you receive the National Pokedex.