After beating the last gym leader go to the north side of sunyshore and a girl will be there and after talking to her you get waterfall
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you do need hm waterfall for mt. conet.There's a waterfall in mt.conet
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.
In the Ice path, there is a guy. there is a pokeball with the HM waterfall below him get it, and he lets you keep it
To my knowledge i don't think there is a waterfall in Pokemon yellow and it is quite irrelevant to the storline if there was one. If you mean a HM named waterfall...i think your on the wrong game, only pearl and diamond have waterfall HM...i think. There are only 5 HM's in Pokemon Yellow Flash, Cut, Fly, Surf, Strength.
You have to surf north of sunyshore city and use the hm waterfall when you get to the waterfall.