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There is a move deleter who can make pokemon forget HM moves.
You have to go to the Move Deleter who is in Lilycove City. The Move Deleter is right by the Department Store.
Find the move deleter.
talk to the move deleter
move deleter in lilycve (end of game)
the move deleter is in canalave city in a house below the pkmn centerthere is a HM deleter in pastoria or in jubilife or in heatrome.
go to cecilia city and go to the move deleter.
In all the Pokemon games, there is a Move Deleter person. Talk to him to delete moves.
go to lilycove and move deleter's house is near ocean
there is a move deleter in fuchsia city (the house to the left of the pokemon center)
Go to the move deleter which he is at lilycove city.
Pokemon cannot forget HM's unless they're in Pokemon Mystery Dungeon. But, if its from Emerald, add another Pokemon to your party that knows surf and ask the move deleter.