You can't. The move deleter in Fuchsia city.
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There's no Dive HM on Pokemon Leaf Green.
you cant
Rock smash
Dive is not an HM in leafgreen you can't get it unless you trade a Pokemon that knows Dive from ruby or sapphire or emerald but it will not work in leafgreen unless your in battle.
In Fuchsia City, the Move Deleter lives in the house on the left of the Pokemon Center. He can make your Pokemon forget moves, including HM's.Go to fuschia city and head to the Pokemon center but enter the house right to the left of it inside is a guy who calls himself the move deleter choose the Pokemon you want to delete the HM move from choose the HM move and say YES to get rid of it.