Hey joey, i made a team working around arceus-bug, here's the team if you want to try it out
https://pastebin.com/Fra4ETxP
Arceus bug that outspeeds standard mega Metagross, and 2 shot with Judgment.
Defensive Giratina-o w/ magic coat.
WP Necrozma-Dusk.
Geomancy Xerneas.
SR + Polish Primal Groudon.
and Moxie mega 'Mence.