In Third Generation Whirlpool is no longer an HM.
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The HM Whirlpool is not obtainable in Pokemon Platinum, for there is no use for it during gameplay.
whirlpool is not classified as a HM in that Pokemon series, only in heartgold/soulsilver is it a HM, in diamond it is only a simple TM (1use)
You cannot get the TM/HM Whirlpool in Pokemon Black or White.
In Ruby (what I have), Wailmer learns it. However, it's practically useless due to the fact that there aren't any whirlpools in Ruby, Saphire, or Emerald. So it is only a move, NOT a HM.
you need a Pokemon that can use HM move whirlpool