Inkay, Malamar, and Hoopa Unbound are the only ones.
I don't think they'd go Psychic-Dark, though. Currently, the other two Types have no interaction with each other. Psychic-Dark would be super-effective against Lunala, and normal effective against Solgaleo. Which just seems weird.
I think it's more likely we'll hit a secondary type that doesn't interact with the other two. But, unfortunately, there is no Type that fits that mold. So I have no clue.




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