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Normal's a pretty worthless secondary type. Back in G1 & G2, normal was a jack-of-all-trades type. Even if their stats were subpar, they usually had a ton of versatility due to their wide TM learnsets and taking neutral damage to all but Fighting and Ghost. Pyroar, Wyrdeer, Drampa, Bibarel, the birds, etc, don't have that wide moveset luxury that the pure normals have. It just seems like something they arbitrarily tacked on.
Although maybe that ghost immunity and handful of decent Normal STAB moves has a lot more mileage than I'm giving it credit.