Okay, here are Deoxys-S and Wobbuffet's percentage weighted usages:
Deoxys-S:
January - 0.753%, February - 0.686%, March - 0.724%. Predicted (not very accurate with only 3 values): 0.735%.
Wobbuffet:
February - 0.827%, March - 0.738%. Predicted (very inaccurate with only 2 values): 0.648%.
Compare these with Garchomp and Gengar:
Garchomp:
October - 3.840%, November - 3.790%, December - 3.502%, January - 3.807%, February - 4.172%, March - 4.113%. Predicted: 4.219%
Gengar:
October - 2.928%, November - 3.011%, December - 3.376%, January - 3.687%, February - 3.908%, March - 3.948%. Predicted: 4.116%
I'd say this is good enough reason to accept both Deoxys-S and Wobbuffet in OU, as I tentatively have already put in my post.