The Gamestop I'm going to is going to rank each Pokemon with a point system, and you can't go over x amount of points for your team. They basically decided teams of legendaries were unfair, but didn't want to outright ban then. =o I guess each store can have it's own decision on that and such.
The guy said no Darkrai, Shaymin, or Arceus, but they can't really tell if you don't put them in your team. Also, be careful with the amount of shinies you have.
XI Wiki

