I was going to put Revenge on Druddigon for a Fighting-type move, but it has -4 priority. I didn't think to put in Superpower because of its stat reduction. Which is more reliable?
I say go with Revenge, Druddigon has a very low speed stat, so that priority won't hurt you much, also Revenge will have 120 power (if you get hit) like Superpower, but without the stat reduction, but if you still want superpower, just equip your poke with a White Herb (Restores stats when they get lowered, just 1 use) ,so you can use it twice before the stat reduction
Hope i helped :3