I chose Gen 1, but Gen 3 was close. Having gimmicky stuff like Castform and Kecleon that doesn't rely heavily on its Normal typing, and mons like Azurill and Swablu that lose Normal once they evolve was my tiebreaker.
Also, Arceus isn't listed for Gen IV.
Call from demon - with dark power to tempt your mind, very proud of the power. Destroy the firing shot!