This time I managed to get a clear using Xerneas, Yveltal, and Zacian. This was significantly harder than my previous clear because Yveltal is so fragile. Yveltal is similar to Pherosoma in that it gains a lot by becoming 20/20 even if you don’t make it an EX. The extra 40 stats in defense make a big difference.
The first sync move is done with Xerneas so all my stats would get raised up. Future sync moves are done with Zacian since I have that as an EX so it could strike the entire foe team. The most annoying thing is Drifblim’s +3 evasion which seems to make it almost unhittable, but whenever you try to raise your own evasion, the foe always hits you. It did take multiple attempts to clear with just this team. If I used Blastoise or Swanna instead of Zacian, it would have been easier due to move gauge speed and ability to heal. The main focus is using Oblivion Wing when possible with Yveltal to keep a healthy amount of HP to take area moves and syncs. Xerneas uses Horn Leech and Dazzling Gleam most of the time. Zacian it depends on the gauge for choosing Behemoth Blade or Play Rough.