beat the elite four, get the national dex from professor oak, go to one island and help the guy in the pokecenter get the gemstone(ruby) from the volcano (north on one island), get the rainbow pass from said person, travel to four island and enter icefall cave. its in the second room ( take southernmost ladder in basement area to reach the ledge with hm 08 [waterfall])
Waterfall is an HM hidden in icefall cave on four island use the ice to navigate you toward a ladder that will lead you to it.
Waterfall
waterfall
It's in the Icefall Cave on Four Island.
its located on four island in the cave
In Icefall Cave, in Four Island
in the cave on 4 island
In icefall cave at four island.
No, it isn't but you can Rock Smash and Waterfall
In Icefall Cave, in Four Island
you get it in icefall cave on 4 island clear the ice to get to the ladder that will lead you to the HM waterfall.
Use the TM waterfall. I think.
Look for yourself thicko!