Looks good, I really have no suggestions for him, except you might want to try out Leech seed in there, Possibly instead of Gyro Ball.
Protect? Give this behemoth Surf or Charge beam ! But besides that he's good.
Switch out Shadow Ball for Calm Mind, Now you can set up Calm Mind for a Sp Atk and Sp Defense boost, anything you burn loses most any physical capabilities, and you have an STAB Hex on, while you have Energy Ball for Coverage, Watch out for Bouffalant and other Sap Sipping normal types.
Although I think you should just ditch him considering you have Chandelure.
For this team having Ferrothorn, you should give him Flash Fire.
Now he can absorb anything Fire attacks like a Boss, and can take anything Fighting based.
Give him Lefties or a Choice Scarf as an item.
I would go Timid on this one for Extra speed, it needs it.
And HP Flying gives great coverage over Focus Blast.
HP Ground would work better than Electric but it's your choice, they're both pretty good.
You need more Physical my friend! only 1 Physical pokemon in your team, and that's your lead!
Cofagrigus is easily ditched consider Chandelure's role in your team, you can find a way to take another pokemon out for something physical.
Perhaps an Electivire, just a suggestion.