Changes in the Ubers tier
Upon redefining Smogon's tier system, Ubers is now known as the tier above OU rather than just a banlist. Mega Rayquaza will not be allowed in this metagame, and instead is moved to our new format named Anything Goes! Outside of the Endless Battle Clause, this format intends to permit the use of anything legal in the cartridge games! Be sure to check it out and play!
—Dell on Nov 30, 2014