If you help Lance beat Rocket in Mahogany town, you will receive it.
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you need a Pokemon that can use HM move whirlpool
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.
The move deleter in Pokemon silver is located in Blackthorn City.
it is a home move to stop the whirl water on the four island where you can get lugia
There is no such move in the game, it only appears in later games.