So... sky battles. To me, it just seems like a regular pokemon battle where ground type moves aren't used. We've had aesthetics on the battlefield for going on three generations, so grass, sand, city streets, water, etc. and so far it just seems like this is the same thing... only in the sky. Unless there's a previously unheard of mechanic that goes into these battles, I'm not seeing what the big deal is.
The only "trick" to them I can think of would be something like Emerald's Battle Palace, where you had to rely on your pokemon to choose it's own moves. The trainer is far below on the ground and the pokemon can't hear you, so you've just got to hope it does what you want.