Seafloor Cavern. To get there you need surf and dive, and once in there you will need strength and rock smash. Seafloor Cavern can be found underwater in route 128.
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In Pokémon Ruby Sapphire and Emerald versions, HM7 contains the move waterfall. You can find the HM in the Cave of Origin.
Hm7 is waterfall, sorry im not sure where i found it though. :-)
HM1 CUT HM2 FLY HM3 SURF HM4 STRENGTH HM5 FLASH HM6 ROCK SMASH HM7 WATERFALL HM8 DIVE --/ninjax/
hm7 waterfall is in the cave of orgin, sootopolis city, you have to go to the magma lair otherwise they won't let you in
It's in the ice path that leads to Blackthorn City.