I've traded with other people and it was fine. Maybe our connection is bad. Is there any other way to trade? I haven't seen Keldeo so GTS wouldn't really work...
Puff, I do run Ray, but the fact that they use Raikou to KO Altarias and Max Potion to heal, its pretty difficult. Also, Zek EX easily runs through 2-3 Chomps. Mewtwo is a problem too. So is an Eviolited Zekrom.