I didn't notice the damage, I thought it was something written. Nevermind! :3

Alright then, let's go for a speedy substitute, enough to take both a Signal Beam and a Swift. Then use Double Team whilst behind the substitute, which should lock Invert into a Swift for both this and the next turn, or if not there is a chance that Signal Beam won't hit anyway. Finish off with a Dragon Rush. (I really wish dark type moves had a higher base power)