Woah, your team looks pretty good on paper, except for that Mandibuzz, your Mandibuzz is all messed up.
First and foremost, get rid of big pecks, and replace it with overcoat. Overcoat will not only protect Mandibuzz from sandstorm and hail damage, but will also protect you from powder moves such as sleep powder and spore (gen 6 only). And I understand that Mandibuzz may need a powerful move in some situations, but I personally believe that brave bird is not worth it on Mandibuzz. If I were you I would replace brave bird with either taunt or foul play.
Nothing wrong with your Conkeldurr, but I personally believe you are wasting guts' potential if you don't give it a flame/toxic orb.
If you want to keep Conkeldurr's set, then give it iron fist ability, because you have 2 punching moves, and his other abilities will be seldom helpful for the set you're currently running for Conkeldurr. If you want to keep guts, them I recommend Conkeldurr hold a flame/toxic orb, and have:
Stone edge is great because you don't have any Pokemon in your party with a rock move.
But that's about it, your team looks very threatening, 8/10!