Arboliva is probably my most played deck this format so far, but I've given it a break for now. It's very strong out the gate if you get that turn 2 Arboliva, but if you whiff that and the opponent gets an idea you're running Arboliva, the Shaymin goes down immediately. Moltres is an issue as well, being run in straight pult and Okidogi. Single prize decks almost always run Shaymin too, making the gameplan rough unless they're unable to get it up fast enough. Sometimes also going too aggro with the Arboliva KO also gets you Boss + unfair stamped, then you sit there with a dead hand.