In R/S/E, the Move Deleter can sometimes be able to not make a Pokemon forget moves. Like my Qwilfish (I know he sucks, but it's from Colosseum) needs to forget Surf to get to Platinum, but the Move Deleter just says "Hm? It seems your QWILFISH doesn't want to forget SURF." And he's been doing that for a year now. How do I get Qwilfish to forget Surf?