Depending on what waterfall you are talking about, there is a waterfall in Robina Zone and in Warlic Zone. Both of them require membership/dragon amulet.
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You play dragonfable?! Hahahahahahaha
(hint: you can only get those wings in dragonfable in the 100 room quest)
you use waterfall at the Pokemon waterfall or the battlefield.
U don't go through the waterfall, u go over the waterfall. The goal is to have the HM waterfall. This HM allows ur Pokemon to climb the waterfall.
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.