>>36566300In the Sinnoh remake that's totally actually really going to happen in Gen 8, there's a new post-game campaign that centers around Giratina and Arceus. Giratina already has their own thing, so that's left unchanged. On top of that though, Arceus also gets an additional form.
ARCEUS: ORIGIN FORME
Origin Arceus would be the fully revived, fully revitalized God of All Pokemon. It would be a Pokemon ready and capable of creating an entire new universe, sitting right there in your party.
Origin Arceus, alongside the usual smatterings of a new form, like new moves, super over-budgeted animations, that sort of thing, it also gains a new ability:
OMNITYPE
With Omnitype, Origin Arceus no longer requires the plates to switch between types. It is every type, it is all. More specifically, Omnitype works as an upgraded Protean. In addition to Origin Arceus changing its type to whatever move it uses, when it is about to be hit by an attack, if it would be weak to that attack with its current type, it switches away from that type to one it is neutrally effective against instead.
To become Origin Arceus, Arceus needs to hold the Original Orb, a signature held item corresponding to the orbs of its brethren. This item can only be held by Arceus, and it boosts the damage of its moves across the board by 20%.