Waterfall is found in the Ice path. You must do some tricky ice sliding puzzle to get to it. It is right in front of you when you get of the giant maze sliding puzzle.
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almost all of the water type Pokemon can learn and use waterfall
In the Ice Cave between Mahogony and Blackthorn.
The HM waterfall is in the ice cave, the cave you use to get to Blackthorn City to get the 8th badge. Just pick up every item that you can see in there and you will find it.
Pokemon Crystal only contained seven HMs. The 8th HM Rock smash isn't available until later generation games. The HM one can get in Pokemon Crystal are cut, fly, whirlpool, waterfall, strength, flash, and surf.
you do need hm waterfall for mt. conet.There's a waterfall in mt.conet