you go to the guy in cancave city in the house
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at canalave city there is a move deleter he is an old man
you cant
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.