Well, I would really like to participate... The only problem is, I haven't beaten the champion yet in X, so there will be a lot of Pokemon I can't Mega Evolve because of it. I have a whole bunch of Pokemon I can possibly use, but they're all level 54-58 (plus a level 59 Zweilous), and I'm not sure how that will compare to the other participants (unless they'll all be set at level 50 or something). Plus, I've never participated in a battle between players in any 6th gen game, so I don't know if anything has changed with regards to battling between people.
As for Super Training, I really don't like it so far. EV training still seems very slow with it, and when you're trying to train a whole bunch of Pokemon with it, it becomes tedious very quickly. I tried it once with a party of Pokemon, and had enough after playing the same sort of mini-games about 20 times. Heck, the Pokemon-Amie mini-games are more fun than these silly balloon trials.