Guys, I voted Sky Battles for the following reasons...
1. Fennekin (and future evolutiosns) is NOT a liability in sky battles. In fact, there is something that aerial Pokemon must fear: A dead-accurate long-range ground-based attack. We already know that in the Pokemon universe, there are several attacks that basically function like a homing missile. I'm pretty sure that another problem exists because most Pokemon don't know to 'pull the lead' (e.g. aim ahead of the traget to increase the chances by letting the projectile flight pattern meet at the location where the target is in the future). If the writers pull off a sky battle with Pokemon still stuck in the ground, it might be similar to having several floating disks in the where Pokemon might jump from one disk to another to cope up (which may happen given the anime's nature).
2. It's a bit fun to watch aerial combat, especially if it follows real-life dogfighting tactics. I find it weird that the anime frequently emphasizes unsafe head-on passes instead of 3 o 'clock- 9 o'clock high deflection shooting and even the most effective 6 o'clock come-from-behind attacks. I truly wonder when will this happen...
3. France is based in Kalos right? Guess what countries have the first aces in real-life history: Germans AND French! A very nice reference for sky battles, right?
So for me, Serena might go into this field, once she found a flying Pokemon that suits her up (Hawlucha, perhaps?). But this might get shattered once Espurr is captured instead. Besides, sky battles, for me, is more of mind games rather than brute strength, between different types of Pokemon that exploits their opponent's weakness while magnifying the Pokemon's strength while watching out their own weakness, making sky battling a unique yet elegant style aside that of conventional Pokemon battling, which isn't about dazzling the audiences but rather aerobatics of taking another person off guard. Personality wise, this might be a good nich for Serena since this deals with elegant fighting style without minding much of appealing the audiences (yet focuses on taking the opponent down). Overall, I want more logical flying Pokemon vs. flying Pokemon battles, where hovering in the air is a no-no (get still in the air and be prepared to get shot down), less head-on passes, more use of long-ranged moves at even closer ranges to ensure hits, and physical moves that requires really elegant moves for it to land
P.S. TO those who won't agree with this, google Lydia Lytvyak, the top-scoring female pilot of all time. She still remained a girl despite shooting down, well, just 12 aircraft on here own and 4 with her female wingmen against planes all piloted by male pilots.
P.P.S. I wanted to criticize a lot of the way air battles are done in the anime, because most of them, are actually unusual and without logic, even defying physics at some times. Besides, I'm yet to see someone who has to take advantage of energy tactics, because it also rightly applies to birds in nature (reasons why birds of prey perch on high altitude before grabbing some other smaller bird in lower altitude, and why prey birds turn sharply to an opposite direction to avoid them)
P.P.P.S. Looks like my obsession on sky battles had taken up