Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Zeraora moved from OU to UU - Zeraora is truly an interesting drop due to its amazing speed tier and great coverage in Close Combat, Fire Punch and Knock Off (I would also say Grass Knot but Seismitoad just dropped so it usage won't be much anymore).
Bisharp moved from OU to UU - It's back...