You use whirlpool in two main areas. When you have to take the test with the elders in the Dragon's Den, you need Whirlpool. When you want to capture Lugia, you have to use Whirlpool to get into the islands.
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You use whirlpool, a field move HM, to get past whirlpools. You have to defeat a certain gym leader and get a certain badge to use whirlpool in the field (outside of battle).
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.
you need the HM whirlpool (whitch you get it at mahogany town when you shut down the machines lance will give you it)
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)