I'm really annoyed now. I had taught my Charizard Cut by HM and Strength as well. After getting the TM Rock Tomb and I wanted to teach it to my Charizard by forgetting Cut. It said 'HM moves can't be forgotten right now.'
So I taught my Greninja Cut and then tried to teach Charizard Rock Tomb but again it said 'HM moves can't be forgotten right now.' And to teach my Greninja Cut it cost me Quick Attack! Grrrrrrrrrr!
What's wrong? Help me please! =]