First off, most of the EXes are pretty bad, the only ones that would see play imo would be Mewtwo, Regigigas, and maybe Groudon. Weaknesses really hurt them a lot, and even if they don't get OHKOed they still drop 2 prizes when defeated and tend to take a lot of energy to attack, so they will eb manageable. If youa re that worried about Eviolite, there is a Weavile in PD or HB (I forget which) which does 90 for 1 darkness energy if the opponent has a Pokemon tool, so that will help a lot. As for before we get an english PD/HB set, yeah that will make Reshiphlosion and Zekrom pretty good (Tornadus too), but they would not be unstoppable.