Sub-berry will not work because of Sashed Caterpie.
Hahahaha! Finally, a set that cannot fail! Can. Not. Fail.
Arceus @ Steel Plate
Impish
252 HP/4 ATK/252 DEF
- Aerial Ace
- Hail
- Recover
Fuhohoho. Caterpie can't 4HKO with max attack/choice band, all crits Bug Bite. Simply Aerial Ace, Hail to remove Focus Bands from the equation, and Recover if neccessary. It's foolproof.
If caterpie is holding a King's Rock then there will be no Focus Band haxxing and Arceus could simply Extremespeed.Caterpie @ King's Rock
-String Shot
-Tackle
-Bug Bite
Turn 1 - String Shot.
Turn 2-12 - Bug Bite Critical Flinch.
Arceus needs Substitute as well.
Remember that in gen 4 Arceus has the 100 EV Cap. It would have to be 100/100/100/100/100/10 instead.
EDIT: This one is beaten by:
Mewtwo @ Leftovers
Specially Defensive
-Toxic
-Recover
Because Judgement never 2HKOs.
Ah yeah, well I guess if it fails for that reason at least it can work for Gen V. I'm still thinking somebody's gonna point out something I've missed though :P
Even without the restriction, it is beaten by the same Mewtwo with Protect.
Caterpie @ Focus Band
-Bug Bite
Hang on with Focus Band every single time Deoxys attacks.
If Deoxys opens with Knock Off it can't beat this one 100%:
Caterpie @ BrightPowder
-Bug Bite
Knock Off misses and Caterpie 2HKOs with Bug Bite.
The thing is that Caterpie can survive an aerial ace while 2HKOing with Bug Bite even with tanga (as long as one of the 2 bug bites scores critical hit).Knock Off, and if it misses then Aerial Ace.
Re-Edit: May have to scrap this, just realised I completely understimated Protect/Detect's ability to foil Shadow Force...