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This information is as of May 30, 2012 according to their tiers in B/W. If any of this information has changed leave a comment about it.
NOTE: Includes the main tiers Uber, OU (Over-used), UU (Under-used), RU (Rarely-used), NU (Never-used). While Pokemon can be used in higher tier than they are assigned, just that one tier is accepted (so Serperior would be just NU, not all of the tiers).