+2 Fire Fang is good, and it provides flinches. It also hits specially defensive steels harder than Fire Blast would. Fire Blast also misses, and gets nerfed harder by rain. DD Nite ran Fire Punch and it didn't even have Swords Dance. I personally ran Fire Blast if I was weak to Skarmory.
I like Jolly since it 2HKOs most steels, but it really depends on your team. "Am I weak to steels and would prefer to hit them harder? Or do I have enough steel coverage from the rest of my team, and would prefer natural bulk?"
You are running a Skarmory, so I am leaning towards Jolly. To take those Fire Blasts better, and you can wear Ferrothorn and Scizor down with Spikes.