Pokemon Black Team Help?

Serperior is great though frenzy plants a waste. Darmanitan is cool but try getting like muscle band on it. Just to boost up some power. Conkeldurr is great too. Try getting bulk up and drain punch. Excadrill of course is great but would become a powerhouse with Swords dance. Haxorus is great too.(brick break could be better instead of slash or draco meteor because it kills ice types).If your gonna use Acrobatics its better to not have an item. Other then that your set. I don't see how you lost last time.