Seconding what Shake it up said..
If you are running a HP on Landorus consider HP Ice. You trade the ability to deal with Bronzong for the ability to kill Gliscor (which is a much more common threat). Consider this...
Pokemon who resist QuakeEdge:
Virizion (2X fire weak, 2X Ice weak)
Breloom (2X fire weak, 2X Ice weak)
Flygon (Resists fire, 4X Ice weak)
Torterra (2X fire weak, 4X Ice weak)
Bronzong (2X fire weak, Resists Ice)
Also if you REALLY want to kill Bronzong / Skarmory you could run Smackdown over Stone Edge. You have to predict really well without Sub, but you can deal with them much better.
Hope I helped
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