Yeah, sometimes they have cool prizes.. This one (2014 International May) gives away an Enigma Berry, I think to everyone that participates...
Serebii updated yesterday with more info on tournaments and there are a lot coming up in Japan but there is also an online competition called 2014 International June and it's running late June! :) The rules are pretty much the same, Double battles, no Mewtwo etc and only Kalos Pokemon (caught or hatched in Kalos) are eligible.
I IV bred Tynamo & Scraggy :( to find out that Tynamo doesn't have Egg moves ;-; Anyway, now before I IV breed again, I am going to
http://play.pokemonshowdown.com/ and test my team there.. :)