You find HM08 Waterfall on BF4 of the Cave of Origin
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The way you get waterfall is by trading the waterfall HM from Fire Red Version or the other Version that have waterfall HM ( you can trade with a link cable or wireless adaptor)
almost all of the water type Pokemon can learn and use waterfall
Go to four island and enter icefall cave HM7 is in there and its waterfall.
Pokemon Firgo Returns is a hacked version of Pokemon Ruby and Saphire. It is not part of the official Pokemon line of Game Boy Advance games.
that hm is waterfall. it is on route 18, on farthest island in a corner.