All Smogon Tier Updates (Gen 7)

December
OU
 * Alakazam-Mega, Bisharp, Buzzwole, Celesteela, Chansey, Charizard-Mega-X, Clefable, Dugtrio, Excadrill, Ferrothorn, Garchomp, Genesect, Greninja, Greninja-Ash, Gyarados-Mega, Heatran, Hippowdon, Hoopa-Unbound, Kartana, Kingdra, Landorus-Therian, Latios, Magearna, Magnezone, Manaphy, Mandibuzz, Mantine, Marowak-Alola, Metagross-Mega, Mimikyu, Nihilego, Pelipper, Pheromosa, Pinsir-Mega, Porygon-Z, Rotom-Wash, Sableye-Mega, Scizor-Mega, Skarmory, Tapu Bulu, Tapu Fini, Tapu Koko, Tapu Lele, Toxapex, Tyranitar, Venusaur-Mega, Xurkitree, Zapdos

January
UU
 * Bisharp OU > UU
 * Hippowdon OU > UU
 * Jirachi UU > OU
 * Mamoswine UU > OU
 * Mandibuzz OU > UU
 * Muk-Alola UU > OU
 * Porygon-Z OU > UU
 * Tangrowth UU > OU
 * Aerodactyl-Mega, Amoonguss, Azelf, Azumarill, Bewear, Blastoise-Mega, Blissey, Breloom, Cobalion, Conkeldurr, Decidueye, Dhelmise, Diggersby, Dragonite, Empoleon, Forretress, Gengar, Gigalith, Gliscor, Gyarados, Hydreigon, Infernape, Keldeo, Krookodile, Latias, Magneton, Mew, Necrozma, Primarina, Raikou, Salamence, Scizor, Serperior, Sharpedo-Mega, Slowbro-Mega, Starmie, Staraptor, Sylveon, Tentacruel, Terrakion, Thundurus, Thundurus-Therian, Tornadus-Therian, Tsareena, Victini, Volcanion, Volcarona, Weavile