the term "bw OU" is a bit vague but generally refers to the "current" generation five metagame, which is BW2 OU (in the same way that dpp OU tends to refer to the gen IV metagame post-HGSS and all). however, BW1 OU specifically refers to the gen V meta, right before BW2 was released. this would mean no therians, no genesect, no keldeo, no techniloom, no kyurem formes, etc.
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