Overheat is often used when you want to neglect Special Attack effort on a fire type. Like the old standard Blaziken and to a lesser extent, Dragon Dance Charizard. I say go for it. But you may want another physical attack on Torkoal, otherwise Curse seems to be a waste. Toxic won't work on that set either, due to Body Slam's paralysis chance. But #1ChanseyFan will be in here with advise, or I'll eat your hat.
P.S. Voted Pudding