in ice cave once you've done the first farely hard farely big icey slidey maze go right(east) then get to the other side of the really easy small maze and there'll be a normal orange ball (item) it's HM07 waterfall
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You can find Waterfall in the Dark Cave.
in the ice path
you get a silver wing from a man in kanto.
Get the HM Waterfall in the ice path then go to victory road click A on the waterfall and your pokemon will go up the waterfall.
i think that wooper can't learn waterfall at a level.