you must have the hm(i dont remember its number)that contains waterfall then when you are in the front of the waterfall press a then click yes and you climbed the waterfall a easier way si to do the walk through walls code(srry if i am spelling wrong im not enghlish) and to get through what cave
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First, you will need Surf, Rock Smash, and Rock Climb (and Waterfall if you want to climb the waterfall). Enter Mt. Coronet from the Hearthome City or Oreburgh City side. Make your way northward through the cave. You will have to go outside in the snow at one point. Keep rock climbing till you find a cave that leads back into the mountain, and the next room should have the waterfall.
You can find Waterfall in the Dark Cave.
it's easy, get the hm waterfall, search for an old man in the island that will give you the hm, it should be around the vicinity of the cave, teach it to a Pokemon and then use it at the bottom of the waterfall, that's how to.. ^^
its in the icefall cave in island4
You find HM08 Waterfall on BF4 of the Cave of Origin