HO with LO Blaziken and Mega Gyarados, lots of fun. Has Xern if you want to use in spotlight, geo/psychock/moonblast/twave.
https://pastebin.com/8RDnbdqF
Primal-Groudon, Blaziken, Arceus-Ghost, Mega Gyarados, Deoxys-Speed, Xerneas
I find Iron Head better than Iron Tail on Gyarados since 68.8% of the time it kills 72hp Xern after rocks, and will 2hko arc-fairy with that chance to flinch.