>>49907858Going by BST, Ultra Necrozma.
I really think they should've taken the opportunity in PLA to give Arceus 200 across all stats, giving him 1200 BST. Also, with the Legend Plate, make it so his attacks change him to the type that's most effective on the target, and on defense, make him the type that resists the attack the most. Like Protean on steroids, I guess.
1200 BST and super effective and resistant? Now THAT is God. And yeah, you wouldn't be able to beat and catch him, but maybe we don't have to???...