Why not a Physical Attack? I mean, it can't hurt your team.

Arceus @ Spooky Plate
Trait: Multitype
EVs: 252 Atk/ 252 Spe/ 4 HP
Adamant Nature (+Atk,-SAtk)
- Brick Break
- Shadow Force
- Swords Dance
- Recover
Or you can go with a Special Arceus

Arceus @ Earth Plate
Trait: Multitype
EVs: 252 SAtk/ 252 Spe/ 4 HP
Timid Nature (+Spd,-Atk)
- Judgement
- Thunderbolt
- Ice Beam
- Psyshock
It seriously doesn't matter, neither will hurt your team.