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Khone
The running water in the river erodes the landscape.When the river tumbles at steep angle over very hard rocks or down a steep valley side it forms a waterfall
nigara falls
I think it was the base of the Elite 4 waterfall, search for it on your poketch... it is also in sinnoh underground.
there is no dive HM in DP but the water related ones are surf and waterfall
You go to where the girl (Jasmine) is under the Gym on the beach and she will give you Waterfall (the HM obviously. You surf on the water behind her and when you get to the waterfall use waterfall, then go through Victory Road, and Then face the Pokemon League.
A waterfall is not considered to be a body of water. The river and often the pond that is at the bottom are considered to be bodies of water though.
You need HM7 Waterfall. This is a water-type move. To find it, go to the beach just before route 223 and talk to the girl there.
it depends on which waterfall :-/
Because the water in a waterfall is higher than water on the ground
Waterfall
You get wet. Depends on the volume of water and the height at which it is falling. For instance standing at the base of Niagara falls will surely kill you.