you need the HM whirlpool (whitch you get it at mahogany town when you shut down the machines lance will give you it)
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Well, if you have a Pokemon that knows whirlpool, you can go back to route 41 and go to the mysterious Whirlpool islands.
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)
SORRY DUDE THERis no hm for whirlpool in pokemon pearl diamond or platinum only heartgold and soulsilver. but that wuld be AWESOME:))
First you must have a badge from the Mahogany Town gym leader (he uses ice types). Next you must find the HM Whirlpool. Equip Whirlpool to a Pokemon and go to one of the Whirl Islands and use the move Whirlpool on a whirlpool.
Whirl Islands only exist in Gold, Silver, Crystal, HeartGold and SoulSilver.