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Sometimes people will want to battle using Teirs. Here's an explanation for those who are new to this:
OU (Overused): All pokemon are accepted in battle. This is the most open option and generally allows for hacks. (I have come across more hacked Celebi's and Jirachi's than I can count).
BL (Borderline): Only OU pokemon are banned from battling at this teir. The battles at this level are more competitive than the OU tier. Also, less hacks are allowed/used at this level. This tier also bans most if not all Uber and Legendary pokemon. Banned from battling at this level?:
UU (Underused): All pokemon at OU and BL tiers are banned from battling at this level. Almost all hacks are banned from UU level play. This is by far THE most competitive tier. Pokemon banned from battling at this level?: