Cynthia gives it to you.
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The HM Whirlpool is not obtainable in Pokemon Platinum, for there is no use for it during gameplay.
How to get the hm cut in pokemon glaze
Dig is not a HM in Pokemon Platinum but a TM, it can be found in the ruin maniacs cave.
In Pokemon Platinum, Flash is a TM.
only Pokemon with sharp claws can learn the hm cut