Honestly just use Tornadus EX over Terrakion or Rayquaza, if your looking for the counters against Zekeels so the fighting ground type, Tornadus EX is PERFECT 100 dmg for 3 energies and with a -20 Resistance to the fighting ground type you cant get better then that, and you dont have to mess with your energy line. As for Darkrai Zekrom EX can 2HKO him easy or OHKO if you got plus powers. Also if your worried about Darkrai Ex, he will take alot longer to get set up due to not having Junk arm anymore and with Tool Scrapper coming out in DRX dark patch may not be used very much anymore.