...Apparently in this broken clusterf*** of a meta what we clearly need is more broken setup sweepers. This isn't even worth replying to but anyway I need to let off steam and want to run lots of calcs.
+2 252+ Atk Arceus Extreme Speed vs. 252 HP / 252+ Def Corviknight: 94-111 (23.5 - 27.7%) -- 86.1% chance to 4HK
Firstly, Corv is used as a blanket check to so much of the metagame that the chances of it being on full health are zero, especially on a team built around EKiller. Corv does nothing back to Ekiller:
0 Atk Corviknight Brave Bird vs. 240 HP / 0 Def Arceus: 99-117 (22.4 - 26.5%) -- guaranteed 4HKO after Stealth Rock
48 Def Corviknight Body Press vs. 240 HP / 0 Def Chople Berry Arceus: 54-64 (12.2 - 14.5%) -- possible 7HKO after Stealth Rock
48 Def Corviknight Body Press vs. 240 HP / 0 Def Arceus: 108-128 (24.4 - 29%) -- guaranteed 4HKO after Stealth Rock
BTW, no-one runs full Phys Def Corv because you need it to blanket check as much as possible. EKiller therefore uses Corv as setup fodder:
+6 252+ Atk Arceus Extreme Speed vs. 252 HP / 48 Def Corviknight: 247-291 (61.7 - 72.7%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
+6 252+ Atk Arceus Shadow Claw vs. 252 HP / 48 Def Corviknight: 289-341 (72.2 - 85.2%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
Not to mention:
+6 252+ Atk Arceus Breakneck Blitz (160 BP) vs. 252 HP / 48 Def Corviknight: 495-582 (123.7 - 145.5%) -- guaranteed OHKO
Whoops.
+6 252+ Atk Arceus Extreme Speed vs. 252 HP / 252+ Def Unaware Quagsire: 109-129 (27.6 - 32.7%) -- 72.4% chance to 4HKO after Leftovers recovery
I love how the only calc you posted that shows Arceus at +6 is against an Unaware mon, and Quagsire can only status EKiller, so if it carries Refresh, it outstalls Quagsire, and uses it as setup bait again. Besides, Quag is only used on stall, which is garbage.
+2 252+ Atk Arceus Shadow Claw vs. 252 HP / 252+ Def Eviolite Corsola-Galar: 152-180 (46.9 - 55.5%) -- 74.6% chance to 2HKO
HAHAHA You poor soul, who even uses this garbage XD Hint: If you're having to use a sh**mon to beat a sweeper, it's probably busted. (Not that Gorsola beats EKiller anyway, it is literally helpless against Refresh varients and gets 2HKOed, as you kindly pointed out, by Shadow Claw varients. And that's assuming EKiller's teammates haven't crippled it with Knock or Toxic).
+2 252+ Atk Arceus Shadow Claw vs. 248 HP / 252+ Def Sableye-Mega: 98-116 (32.3 - 38.2%) -- 97.3% chance to 3HKO
+6 252+ Atk Arceus Shadow Claw vs. 248 HP / 8 Def Sableye-Mega: 259-305 (85.4 - 100.6%) -- 81.3% chance to OHKO after Stealth Rock (again, no-one runs Phys Def on this thing, it's only used on stall, gets used as setup bait, and it wastes your mega slot XD)
Also, unbanning only EKiller, implies a complex ban on Arceus+Z Crystals other than Normalium, and Arceus+Plates. That is so dumb I don't even want to begin discussing it.