Level 32. When Bayleef evolves into Meganium. If it doesn't have it, it won't get it. Sorry.
Source(s): Mine just evolved and learned it.
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Chikorita - Bayleef lvl 16 Bayleef - Meganium lvl 32
Salamence does not learn Dragon Dance by leveling up. It can learn Dragon Dance from its father as an Egg Move.
Vileplume, Paras, Parasect, Chikorita, Bayleef, Meganium, Roselia and Shaymin all learn Aromatherapy via level up in Diamond/Pearl.
i think that wooper can't learn waterfall at a level.
it evolves into bayleaf at level 16, and meganium at level 32.