ZU

An acronym for ZeroUsed, a usage-based Smogon tier containing all Pokemon that do not receive enough usage in the PU tier or higher. It is the current lowest usage-based Smogon tier.

Person 1: "Aw man. I love Beartic, but it sucks that it doesn't even have a use in PU."
Person 2: "Maybe its good in ZU then, you should check it out there."