What do these mean: OU, BL etc.
Uber,OU,BL,UU,NU are tiers.Tiers are classification of pokemon based on stats,movepool,ability etc. http://bulbapedia.bulbagarden.net/wiki/Tier
Uber, OU(overused), BL(borderline), UU(underused), and NU(neverused) are tiers used to classify different ability/skill levels of pokemon in a competetive battling environment.
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