For example, smogon tier, etc etc etc
Ok, well the tiers that people battle in are:
There's one unofficial tier called PU (A bit like NeverEverUsed). The Pokemon that have less than 3.14% of usage in NU go there.
Also, Pokemon Online, Neoseeker make their own tiers.
I think that there are only tiers created by Smogon. There also are tiers created by serebii, Pokemon online, and neoseeker.
If you combine them all, it would be(I think):
2 Standards (OU)
3 Borderline (BL)
4 Underused (UU)
5 Borderline 2 (BL2}
6 Rarelyused (RU)
7 Never Used (NU)
8 Not Fully Evolved (NFE)