On Routes 208 and 210, in Mt. Coronet 4F, in Victory Road B1F, and between Victory Road and the Pokémon League.
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Jasmine will give HM Waterfall to you at the beach after defeating Volkner.
To get HM7 (Waterfall) in Platinum you can get it at Sunyshore City talking to Jasmine at the north of the city.
The HM Whirlpool is not obtainable in Pokemon Platinum, for there is no use for it during gameplay.
after beating the 8th gym leader go to the beach and the lady will give you the HM 7 waterfall
no when you go up (or down) the waterfall the gravity shifts and you just surf across.