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The crazy thing is that this is the Arceus game and Arceus itself is a Pokemon who's whole thing is the fact that it can be any type depending on the held item. It is one of the Pokemon who's entire thing is its ability, and one thats even dependent on held items.
Weird to imagine they'd make a game centered around Arceus of all things but without abilities and held items on which it relies. GF has done crazier things though. Its motives are unknowable.