the move deleter is in canalave city in a house below the pkmn center
there is a HM deleter in pastoria or in jubilife or in heatrome.
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you go to the guy in cancave city in the house
at canalave city there is a move deleter he is an old man
talk to the move deleter
fly is an HM and no Pokemon can forget an HM.
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)