Ground Arceus is the most reliable one to my knowledge. It has a good matchup against Primal Groudon and NDM, who are some of the most common Stealth Rockers.
Arceus-Ground @ Earth Plate
Ability: Multitype
EVs: 252 HP / 40 Def / 24 SpD / 192 Spe
Timid Nature
- Judgment
- Recover
- Ice Beam
- Defog
This is the set the Smogon Analysis reccomends for Support Groundceus.
Thank you - I’ll try to stick to my ultra sun exclusive restriction but this is still good to know.