[Exon Auxus]

Originally Posted by Tasteless

A BL Pokemon is a pokemon that is UU by usage and OU by power.

In other words, an OU Pokemon that isn't used as much.

BL isn't really a tier, it's just used to keep too powerful of Pokemon from falling into UU.

Or vice-versa, essentially. Although some people can consider it as a tier because of "BL Tournaments". For example, in the Pe2k Olympics, OP made UU, BL, OU, and Uber tier tournies.