Apparently only one Mega Evolution pokemon is allowed on battle. If that's the case, then I don't think we'll be seeing a trainer with a whole team of Mega pokemon. And since it's solely an in-battle thing, we probably are not going to see pokemon in their Mega forms for the majority of the time. With all that said, I can imagine that any potential use of Mega pokemon might be reserved for special battles such as a battle in the league, possible important Ash and co. vs. Team Flare battles, or maybe Korrina has since she apparently has some sort of connection to them. We may or may not have a debut type of episode for them. While the whole concept is pretty big, the actual execution may not be as major as I initially thought it would be after all, especially when there's other new game mechanics that may be shown off in the anime as well. With that said though, I am still curious to see the characters and pokemon involved when the time comes to showcase Mega Evolutions. For me, I'd like see one of Ash's pokemon (either current or old), if possible, to showcase a Mega Evolution.