So I mentioned this in the gym thread, but a lot of people have been joking about being able to have motorcycle battles like Yu-gi-oh 5D's, but thinking about it, I don't think this is all that crazy an idea to have a gimmick battle style which takes place while riding a Pokemon and I'm wondering if they're seriously considering something like that. It's not at all that uncommon for action games to have more mobile battles that involve the player chasing/being chased by an enemy (in particular, you see this quite frequently for bosses in Sonic the Hedgehog games). They could potentially have you engage in turn based battles while you're running through the open world, possibly even adding attacks that serve as obstacles in the overworld for you to dodge in sort of an LA style. It'd also be somewhat of an evolution of what they did in Pokemon Ranger Guardian Signs with some of the sky chase segments on Staraptor and later Latios/Latias (and in fact one of the most memorable parts of that game IMO was where you were trying to reach an island called Mt. Layuda where Zapdos was, but it was protected by constant thunderstorms, so when you went there for the first time there was a section where you were riding Latios/Latias and continuously dodging thunderbolts as you made your way to the island). That could actually be pretty intense and fun.
Its certainly possible. Part of me wonders if its less to do with the actual battles but more the pre-gym challenges. I could see a possibility of you having to either beat an opponent to qualify for one gym, but another you have to complete a time trial, in another you have to act a delivery driver and drop off items. That way they could have lots of different trials but all themed around transport.