EVs: 252 HP/4 Sp. Def/252 Def
- Cosmic Power
- Defog/Stealth Rock
Cosmic Power allows Arceus to become insanely bulky, taking even super effective hits easily. Defog allows Arceus to clear away entry hazards such as Spikes, Toxic Spikes, and Stealth Rock, while Stealth Rock can be used to set up your own entry hazards. Judgement is your way of doing damage, while Toxic puts your opponent on a timer. Recover is self explanatory.
The EVs given are to maximize bulk. Leftovers is to provide steady recovery. Multitype is the only ability Arceus can have. Finally, a calm nature is used to give Arceus some special bulk without any EV investment.
Steel types: Arceus can’t poison them, and cannot do much with Judgement.
Marshadow: Judgement has no effect on Marshadow, does good damage with Close Combat, and can take Cosmic Power boosts with Spectral Thief.
Taunt users: completely shuts down non- Judgement Arceus.
Let me know if there are any more counters.
This thing will annoy your opponent to the point of a forfeit!