No. Latias EX has so many things in this format that hit it: Thundurus, Kyurem, Black Kyurem, Rayquaza, Absol, Cobalion (both), etc. You don't win against anything, and Barrier Break is too weak to hold up on its own.
As for Latios, it's 100% outclassed by Black Kyurem in the only deck that...