OU: The original and most basic tier of them all

Common OU 'mons can include...

Dragapult
Landorus (Therian Forme)

OU is your basic tier, reserved for only the best (but not overbearing) 'mons. A Pokemon is truly OU if it can consistently maintain above a ~4.5% usage rate in this tier. If a 'mon falls below this threshold, it will be dropped to UnderUsed