Mold Breaker is so anti-meta in this since everything has Magic Bounce.
Regigigas is a very powerful thing to face. Shedinja is a whore. :(
Imposter Blissey is the best thing ever btw, Choice Scarf or not.
Also, I've been running a Simple Tail Glow Deoxys-A with screen support. It's pretty good. I keep getting revenged by ScarfBlissey though. :(