There is no such move in the game, it only appears in later games.
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In Third Generation Whirlpool is no longer an HM.
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.
HM 8 doesn't exist in Pokemon Fire Red or Leaf Green.