http://www.smogon.com/forums/threads/smogon-usage-based-tier-update-february-2015.3528836/#post-6025484

Celebi moved from UU to OU
Heracross moved from OU to UU
Armaldo moved from NU to PU
Pidgeot moved from RU to UU
Gligar moved from RU to UU
Heliolisk moved from RU to NU
Glalie moved from NU to RU
Salamence moved from OU to UU
Manaphy moved from BL to OU
Torkoal moved from NU to PU
Sceptile moved from RU to UU
Terrakion moved from OU to UU
Pawniard moved from NU to PU
Diancie moved from UU to OU
Serperior moved from BL2 to UU
Quagsire moved from RU to NU
Virizion moved from RU to NU
Claydol moved from RU to NU
Mawile moved from RU to NU
Raikou moved from UU to OU
Kabutops moved from NU to RU
Musharna moved from BL4 to NU
Bouffalant moved from PU to NU
Scyther moved from PU to NU
Pinsir moved from OU to UU
Jirachi moved from UU to OU
Probopass moved from NU to PU
Accelgor moved from NU to RU
Starmie moved from UU to OU