When going through the cave between mahogany and blackthorn city a guy will stop you. He will say he has lost his item, its below you on the screen. Just go through the little ice puzzle and there ya go, waterfall. When you pass him again he says you can have it. You cannot get to blackthorn city without getting the HM.
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you will find waterfall on the 1st floor on ice path
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.
HM07 Waterfall is found on the Ice Path.
You can find Waterfall in the Dark Cave.
in the ice path