Hydreigon: Either Blackglasses or Dragonfang
Chandelure: Charcoal, and teach it Fireblast
Kingdra: Mystic Water or Dragonfang
Metagross: Metalcoat or Odd Incense
Shuckle: Maybe get rid of him for something a little more usable, or at least give it a few good moves. Maybe rockslide and give it a Hardstone to hold?
Foretress: It probably won't need it, but a Silkscarf will up Explosion's power a bit.
As for moves for your Metagross, it should have, if possible:
That's the best set-up I can think of for your team. Good luck. :)