If so where should I go and who do I talk to?
You're looking for the Move Deleter's house, he lives in Canalave City.
There is a house in Canalave City at the right-hand side with an old man inside.Talk to him and he will make your Pokemon forget any move,even HMs!
You look for the move deleter house in canalave city after the bridge! hope this usefull...
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