>>57193735There are, as of posting, 197 mons tiered ZU by usage. That is 19% of the entire national pokedex; the proportion would be even higher if only fully evolved mons were counted, and/or if you only counted mons actually in SV (which is mostly academic at this point)
For comparison, the 2 usage tiers above it are PU (with 40 mons) and NU (with 47 mons)
Smogon seriously needs more tiers because even ZU is overcrowded and powercrept, and there's a lot of mons in it with barely any usage due to being outclassed (sometimes in every single way), but no lower tier to drop to where they might be worth using (due to the mons outclassing them being in a higher tier and thus banned from the outclassed mon's tier)