Knight of Cydonia
I COULD BE BANNED!
I did a search and there is no mention of Air Balloon at all. It's one of the many options Aegislash has and is particularly useful for spin blocking Excadrill and walling Gliscor, Garchomp, Landorus-t and Landorus-i amongst others. These traits are very useful for HO at least which is what I was using it on.