>>50851918The lore implications are that a ??? Type Arceus is something that should not occur or exist.
Arceus made plates for each type barring ???, most likely as the concept of ??? is undefined or doesn't exist purely due to its nature.
??? is the void, think of the term NULL in computing, where it is absolute absence of anything, not even 0.
Being that Arceus can control both Time and Space as it is above Palkia and Dialga, and that even Arceus's regular form is Normal type which means Arceus is something. This would mean to achieve a ??? Type Arceus would be cataclysmic for reality, as its the equivalent to dividing by 0.