Hello,
Tapu Lele, Bisharp and Weavile see a huge uptick in usage, same mention can be said about Melmetal and Dragonite, they all surge in usage because of different factors: Tapu leles Choice Specs set is hard to switch into, Bisharp and Weavile provide a Ghost-resist and can put offensive pressure on opposing Pokemon, first and foremost Dragpult, Melmetal is a check to the aforementioned Tapu Lele and Dragonite can deal with Grass-spam very well, aka Rillaboom + Kartana, and it also checks Volcarona, Heatran and Urshifu-R very well due to longevity in Roost. Moreover Dragapult and Landorus-T are still on top of their game. Zeraora and Tapu Koko alongside Rotom-W are great checks to Tornadus-T and the former two provide natural speed control and the latter has a great typing to sponge most hits and is a great check against the ever common Heatran. Heatran is also on plenty of teams because Volcarona sees also a surge in usage. Other Pokemon which are great are specially defensive Clefable against Dragapult, Hydreigon, and Kyurem. Other picks are Tapu Bulu, Tangrowth, Corviknight, Magnezone, Slowking, and Victini, which are worthy to mention. They all are great Pokemon at the moment.
Hope that brief explanation helped :)