Go to the move deleter which he is at lilycove city.
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go to lilycove city, write by the shopping place, go into the house next to it and that is the move deleter.
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There's a move deleter in blackthorn city he can remove hm moves.
Find the move deleter.
You should teach HM moves to a pokemon that you will not be using, as you can't forget HM moves until you get to a move deleter. Grass type Pokemon's can usually be thought cut.
He lives in one of the houses in Blackthorn City.