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Bootleg OU usage stats from January. No "official" graphic since it's not a shift month but somebody posted this on Smogon.
Notable changes are Clefable dropping, Cinderace rising to top 3, Slowbro rising to top 10 and Hydreigon and Dragapult rising by a lot.
Skarmory would have made OU if it was a shift month and Latios would have dropped out of OU.