Darkrai/Weavile

Using Spiritomb, you can use his move to put damage on all cards on the opponent's field, making it easy to control who comes to the front with Cyrus, as well as letting Weavile EX always have the damage boost. Weezing is here as another starting option as he combos well with Darkrai. Weezing can poison the active pokemon while Darkrai damages it with his ability and you can get some good damage very early in the game. As you build Darkrai, you can send him in with his guaranteed 80 damage move and his 20 damage dealing ability, making him the ace in the hole. I put Rocky Helmet in this deck because I think the extra chip damage is more important than the extra health, but you can switch that up however you like.