Whirlpool isn't a HM in Pearl because you don't need Whirlpool at any point in the game because there aren't any whirlpools.
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SORRY DUDE THERis no hm for whirlpool in pokemon pearl diamond or platinum only heartgold and soulsilver. but that wuld be AWESOME:))
Whirlpool isn't in Pokemon Yellow Version.
You cannot get the TM/HM Whirlpool in Pokemon Black or White.
The HM Whirlpool is not obtainable in Pokemon Platinum, for there is no use for it during gameplay.
you need a Pokemon that can use HM move whirlpool