I hate to admit this, buuut Decidueye will be the best starter ( im a popfag ), and I can actually see it getting usage in OU. Yes, we get it, its stats aren't amazing, but 70 speed for utlity aint terrible, defenses are decent, attacking stats are decent and type. offer some good resists.

Now, spirit shackle + baton pass is a bane for other defensive teams as it can lock a pokemon in then switch. nasty plot AND swords dance + baton pass is great to. Roost is awesome. AND it has DEFOG. AND ITS NOT WEAK TO ROCKS AND ITS TYPING BEATS MOST ROCKERS. This thing will be good even though I hate to admit it.