Personally, I plan to use my old team from Poke'mon Y, which is:
1. * Rayquaza, Focus Sash.
2. Darkrai, Quick Claw.
3. * (F) Kangaskhan, Kangaskhanite.
4. * Arceus, Pixie Plate.
5. Zygarde, Earth Plate.
6. Volcanion, Leftovers.
I may use different items, depending on what new ones they create...