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I'm in the new type camp.
>Flying
doesn't fly or float, and at least stuff like Dodrio is half flying, not pure. And if it were flying, they'd make it more obvious. Eeveelutions are about Eevee adapting to an environment. Every Eeveelution makes it obvious what type it is. If it's flying, why doesn't have wings or something obvious to show it?
>Bug
Doesn't look like an insect or anthropod like pretty much every other bug type. Again, they would have made it more obvious
Normal is the only other theory that I half some belief in.