16 SpA lets you ohko Kart with Clangorous Soulblaze after SR so you can use it to boost up and gives you 93.8% to ohko Blacephalon with Clangorous Soulblaze, you can bump this up to 20 to guarantee the ohko on Blace, but then you go to 93.8% chance to ohko 40 hp mega mawile after rocks instead of guaranteed, and you should have some hazard on the field before you attempt to sweep with kommo-o anyway, so you're better off with the 248-16 split imo. 244 Speed EVs let you outpace Ash-Gren at +1. PJab over EQ for Lele and Bulu, most EQs targets are covered well enough by CC + hazards.
S to A- rank Pokemon on the VR:
Landorus-T: 156 SpA OHKOs offensive with Clangorous Soulblaze after SR, not a hard mon to chip though
Toxapex: SpDef Pex, +1 252+ Atk EQ only does 72.5-85.8, +2 252+ does 97-114.1, +2 128+ Atk EQ for OHKO after rocks, but this mon will haze you - have something on your team to lure it.
Ferrothorn: Stat of +1 298 (60+ EVs) for CC ohko against 252/88+ Def spread
Greninja-Ash: 267 speed at +1 to outspeed, 244 EVs
Heatran: +1 0 atk cc kills 212/44 spread
Kartana: 16 SpA EVs for clangorous to ohko, +1 CC ohkos at with 0 evs as well
Magearna: +1 252+ EV CC has 37.5% chance to ohko no investment after rocks, 81.3% after 1 spike, eq has 93.8% chance to ohko after rocks
Tapu Koko: +1 EQ is a guaranteed kill after rocks with no investment, poison jab needs
Tyranitar: CC guaranteed ohko
Zygarde: Clangorous Soulblaze guaranteed ohko
Celesteela: The more attack the better; +1 252+ CC 2hkos past lefties + protect
Clefable: Nope. Have something on your team to lure it.
Greninja: 184 Speed EVs to outspeed at +1
Kyurem-B: CC or CS are enough
Mawile (Mega): +1 248+ CC needed to OHKO 40 HP variant after rocks
Scizor (Mega): +1 144+ EVs to 2HKO after rocks
Tapu Bulu: Desparately need poison jab - +1 0 investment ohkos AV variant
Tapu Lele: EQ doesn't cut it, need +1 ~100+ evs Poison Jab
Volcarona: Can't really OHKO but it doesn't do much to you in return, just play carefully around flame body with clangorous/clanging
Blacephalon: 20 SpA EVs to OHKO with CS
Hoopa-U: +1 0 EVs OHKOes
Keldeo: +1 208+ CC ohkoes after rocks
Latios: Clangorous takes care of it
Lopunny (Mega): CC fodder
Magnezone: CC fodder
Pinsir (Mega): 0 EVs clangorous will OHKO if base form takes SR damage,
Sableye (Mega): Can potentially break through it with clangorous in exchange for getting burned, would need more than 100 SpA EVs though
Tyranitar (Mega): CC Fodder
Venusaur (Mega): Bulletproof to block sludgebomb, can boost up on