>>22672941I'd consider replacing Primal Kyogre for one of the Mega Mewtwos, assuming hacks. OPs pic has MegaRay and Mewtwo-Y.
Actually, I'd probably also replace Primal Groudon. I don't know who would win the weather war, Groudon or Rayquaza, but who ever loses is getting a 4x weakness. Groudon is also much weaker offensively without his weather, so I'd drop him. I'd add Yveltal: Flying-type to abuse Delta Stream and has access to Taunt.
Opponent's first turn:
>M-RayProbably just smashes face. We'll have enough set-up sweepers.
>Arceus used Swords DanceExtreme Speed incoming
>Yveltal uses TauntShuts down Destiny Bond and other abuse strategies.
>Mega Mewtwo uses somethingWhich Mewtwo we even using?
>Xerneas used Geomancy>Oh fuck son, Power Herb!Sweep incoming