UUs
UUs

Based on Oct-Nov-Dec statistics. These tiers will be updated monthly. The consensus appears to be that UU Beta should be implemented now as an "unofficial" tier with an active ladder. LC UU and Doubles UU have not been discussed to my knowledge.
TogeSR/Lumen-Pokemon-Showdown,arkanox/MistShowdown,Firestatics/Omega-Alpha,MayukhKundu/Technogear,RustServer/Pokemon-Showdown,SilverTactic/Showdown-Boilerplate,scotchkorean27/Pokemon-Showdown,JennyPRO/Jenny,JellalTheMage/PS-,MeliodasBH/Articuno-Land,ehk12/coregit,Pablo000/aaa,TheManwithskills/Server-2,SerperiorBae/PokemonShowdown2,Hidden-Mia/Roleplay-PS,MayukhKundu/Mudkip-Server,kuroscafe/Paradox,MasterFloat/LQP-Server-Showdown,MayukhKundu/Technogear-Final,BadSteel/Omega-Pokemon-Showdown,TheManwithskills/DS,Ecuacion/Pokemon-Showdown,Pokemon-Devs/Pokemon-Showdown,Pikachuun/Pokemon-Showdown,Kill-The-Noise/BlakJack-Boilerplate,lFernanl/Lumen-Pokemon-Showdown,Mystifi/Exiled,sama2/Dropp-Pokemon-Showdown,TheFenderStory/Pokemon-Showdown,azum4roll/Pokemon-Showdown,lFernanl/Lumen-Pokemon-Showdown,ZeroParadox/ugh,TheDiabolicGift/Showdown-Boilerplate,TheManwithskills/Dusk--Showdown,Stroke123/POKEMON,MayukhKundu/Flame-Savior,Werfin96/Ultimate,TheManwithskills/COC,comedianchameleon/test,sama2/Universe-Pokemon-Showdown,Thiediev/Pokemon-Showdown,SilverTactic/Pokemon-Showdown,Flareninja/Hispano-Pokemon-Showdown,Elveman/RPCShowdownServer,Kevinxzllz/PS-Openshift-Server,Pikachuun/Joimmon-Showdown,Enigami/Pokemon-Showdown,Adithya4Uberz/KTN,piiiikachuuu/Pokemon-Showdown,Extradeath/advanced,HoeenCoder/SpacialGaze,BuzzyOG/Pokemon-Showdown,ehk12/bigbangtempclone,SubZeroo99/Pokemon-Showdown,PrimalGallade45/Dropp-Pokemon-Showdown,piiiikachuuu/Pokemon-Showdown,Atwar/http-server-femalehq.rhcloud.com-80.psim.us-,urkerab/Pokemon-Showdown,theodelhay/test,JennyPRO/Jenny,Atwar/http-server-femalehq.rhcloud.com-80.psim.us-,panpawn/Gold-Server,MeliodasBH/boarhat,AvinashSwaminathan/lotus,Irraquated/Pokemon-Showdown,Vacate/Pokemon-Showdown,Extradeath/psserver,aakashrajput/Pokemon-Showdown,BlazingAura/Showdown-Boilerplate,DesoGit/Tsunami_PS,SerperiorBae/Bae-Showdown-2,sama2/Viridian-Pokemon-Showdown,Extradeath/advanced,catanatron/pokemon-rebalance,ehk12/bigbangtempclone,hayleysworld/serenity,svivian/Pokemon-Showdown,Pikachuun/Joimmon-Showdown,ScottehMax/Pokemon-Showdown,kubetz/Pokemon-Showdown,CharizardtheFireMage/Showdown-Boilerplate,Oiawesome/DPPtServ2,hayleysworld/serenityserver,Atwar/server-epilogueleague.rhcloud.com,comedianchameleon/test,Kokonoe-san/Glacia-PS,TogeSR/Lumen-Pokemon-Showdown,AbsolitoSweep/Absol-server,zczd/enculer,Sora-Server/Sora,megaslowbro1/Showdown-Server-again,UniversalMan12/Universe-Server,Ransei1/Alt,Flareninja/Sora,svivian/Pokemon-Showdown,SilverTactic/Dragotica-Pokemon-Showdown,Atwar/server-epilogueleague.rhcloud.com,forbiddennightmare/Pokemon-Showdown-1,Checkinator/Pokemon-Showdown,cadaeic/Pokemon-Showdown,Flareninja/Lumen-Pokemon-Showdown,javi501/Lumen-Pokemon-Showdown,TheManwithskills/New-boiler-test,Gold-Solox/Pokemon-Showdown,SerperiorBae/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,Sora-Server/Sora,sama2/Viridian-Pokemon-Showdown,xfix/Pokemon-Showdown,KaitoV4X/Showdown,RustServer/Pokemon-Showdown,abrulochp/Dropp-Pokemon-Showdown,kotarou3/Krister-Pokemon-Showdown,BlazingAura/Showdown-Boilerplate,Breakfastqueen/advanced,Darkshadow6/git-remote-add-scalingo-git-scalingo.com-pokemoonforums,Ridukuo/Test2,SilverTactic/Showdown-Boilerplate,SolarisFox/Pokemon-Showdown,Flareninja/Showdown-Boilerplate,Vacate/Pokemon-Showdown,Lauc1an/Perulink-Showdown,abulechu/Dropp-Pokemon-Showdown,ZestOfLife/FestiveLife,jumbowhales/Pokemon-Showdown,gustavo515/test,CrestfallPS/Pokemon-Showdown,hayleysworld/Pokemon-Showdown,Darkshadow6/git-remote-add-scalingo-git-scalingo.com-pokemoonforums,Alpha-Devs/Alpha-Server,KewlStatics/Alliance,Articuno-I/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,kotarou3/Krister-Pokemon-Showdown,lFernanl/Pokemon-Showdown,DalleTest/Pokemon-Showdown,Ecuacion/Pokemon-Showdown,panpawn/Gold-Server,SilverTactic/Pokemon-Showdown,Pikachuun/Pokemon-Showdown,Syurra/Pokemon-Showdown,Zipzapadam/Server,Elveman/RPCShowdownServer,abulechu/Lumen-Pokemon-Showdown,Guernouille/Pokemon-Showdown,Flareninja/Pokemon-Showdown,MasterFloat/LQP-Server-Showdown,anubhabsen/Pokemon-Showdown,AnaRitaTorres/Pokemon-Showdown,MasterFloat/Pokemon-Showdown,TheDiabolicGift/Lumen-Pokemon-Showdown,Volcos/SpacialGaze,Zarel/Pokemon-Showdown,Git-Worm/City-PS,gustavo515/final,CreaturePhil/Pokemon-Showdown,AWailOfATail/awoat,zek7rom/SpacialGaze,psnsVGC/Wish-Server,ZeroParadox/BlastBurners,EmmaKitty/Pokemon-Showdown,HoeenCoder/SpacialGaze,PS-Spectral/Spectral,comedianchameleon/servertest1,TheDiabolicGift/Showdown-Boilerplate,CreaturePhil/Showdown-Boilerplate,Parukia/Pokemon-Showdown,svivian/Pokemon-Showdown,miahjennatills/Pokemon-Showdown,Gold-Solox/Pokemon-Showdown,MeliodasBH/Articuno-Land,panpawn/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,TheManwithskills/DS,SSJGVegito007/Vegito-s-Server,Volcos/SpacialGaze,Enigami/Pokemon-Showdown,hayleysworld/Pokemon-Showdown,Oiawesome/DPPtServ2,iFaZe/SliverX,Mystifi/Exiled,brettjbush/Pokemon-Showdown,Sora-Server/Sora,yashagl/yash-showdown,TheDiabolicGift/Lumen-Pokemon-Showdown,Ridukuo/Test,Enigami/Pokemon-Showdown,Kevinxzllz/PS-Openshift-Server,JellalTheMage/Jellals-Server,hayleysworld/serenity,Wando94/Spite,sama2/Lumen-Pokemon-Showdown,sama2/Dropp-Pokemon-Showdown,ankailou/Pokemon-Showdown,Parukia/Pokemon-Showdown,Pikachuun/Touhoumon-Showdown,lFernanl/Zero-Pokemon-Showdown,DesoGit/TsunamiPS,lAlejandro22/lolipoop,AWailOfATail/awoat,FakeSloth/wulu,SkyeTheFemaleSylveon/Pokemon-Showdown,hayleysworld/serenityserver,Flareninja/Pokemon-Showdown-1,DesoGit/Tsunami_PS,TheFenderStory/Showdown-Boilerplate,Articuno-I/Pokemon-Showdown,KaitoV4X/Showdown,SkyeTheFemaleSylveon/Mudkip-Server,yashagl/pokecommunity,SerperiorBae/Bae-Showdown-2,Neosweiss/Pokemon-Showdown,ZeroParadox/BlastBurners,Firestatics/Omega-Alpha,Bryan-0/Pokemon-Showdown,Luobata/Pokemon-Showdown,VoltStorm/Server-pokemon-showdown,CreaturePhil/Showdown-Boilerplate,gustavo515/batata,AustinXII/Pokemon-Showdown,CharizardtheFireMage/Showdown-Boilerplate,kuroscafe/Paradox,Neosweiss/Pokemon-Showdown,SolarisFox/Pokemon-Showdown,AvinashSwaminathan/lotus-v3,DarkSuicune/Kakuja-2.0,xfix/Pokemon-Showdown,ZeroParadox/ugh,Nineage/Origin,Flareninja/Sora,SerperiorBae/BaeShowdown,megaslowbro1/Pokemon-Showdown,Flareninja/Lumen-Pokemon-Showdown,jd4564/Pokemon-Showdown,Breakfastqueen/advanced,hayleysworld/harmonia,Zipzapadam/Server,Disaster-Area/Pokemon-Showdown,TheManwithskills/Creature-phil-boiler,Ecuacion/Lumen-Pokemon-Showdown,Chespin14/Custom-Platform-Pokemon-Showdown,MasterFloat/Pokemon-Showdown,svivian/Pokemon-Showdown,yashagl/pokemon,AvinashSwaminathan/lotus-v2,DarkSuicune/Kakuja-2.0,Tesarand/Pokemon-Showdown,Alpha-Devs/OmegaRuby-Server,kupochu/Pokemon-Showdown,Disaster-Area/Pokemon-Showdown,lFernanl/Mudkip-Server,AustinXII/Pokemon-Showdown,KewlStatics/Showdown-Template,theodelhay/test,ZestOfLife/FestiveLife,Irraquated/Showdown-Boilerplate,Ransei1/Alt,lFernanl/Pokemon-Showdown,megaslowbro1/Pokemon-Showdown-Server-for-megaslowbro1,SerperiorBae/Bae-Showdown,xfix/Pokemon-Showdown,Irraquated/EOS-Master,MayukhKundu/Technogear-Final,Tesarand/Pokemon-Showdown,HoeenCoder/SpacialGaze,javi501/Lumen-Pokemon-Showdown,lAlejandro22/lolipoop,MayukhKundu/Technogear,yashagl/pokecommunity,PauLucario/LQP-Server-Showdown,Checkinator/Pokemon-Showdown,Legit99/Lightning-Storm-Server,EienSeiryuu/Pokemon-Showdown,SerperiorBae/BaeShowdown,Irraquated/Pokemon-Showdown,danpantry/Pokemon-Showdown,comedianchameleon/test,abrulochp/Lumen-Pokemon-Showdown,Firestatics/Firestatics46,aakashrajput/Pokemon-Showdown,yashagl/pokemon,NoahVSGamingYT/Pokemon-Showdown,abulechu/Dropp-Pokemon-Showdown,Psyientist/Showdown-Boilerplate,SerperiorBae/Pokemon-Showdown-1,bai2/Dropp,k3naan/Pokemon-Showdown,Pikachuun/Pokemon-Showdown-SMCMDM,panpawn/Gold-Server,Fusxfaranto/Pokemon-Showdown,abulechu/Lumen-Pokemon-Showdown,hayleysworld/asdfasdf,xfix/Pokemon-Showdown,LustyAsh/EOS-Master,Pablo000/aaa,kuroscafe/Showdown-Boilerplate,TheManwithskills/Creature-phil-boiler,brettjbush/Pokemon-Showdown,Wando94/Pokemon-Showdown,Zarel/Pokemon-Showdown,asdfghjklohhnhn/Pokemon-Showdown,zczd/enculer,Ridukuo/Test2,Flareninja/Pokemon-Showdown,abrulochp/Dropp-Pokemon-Showdown,PrimalGallade45/Dropp-Pokemon-Showdown,danpantry/Pokemon-Showdown,yashagl/pokemon-showdown,anubhabsen/Pokemon-Showdown,Flareninja/Showdown-Boilerplate,DarkSuicune/Pokemon-Showdown,Breakfastqueen/advanced,superman8900/Pokemon-Showdown,CreaturePhil/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,ehk12/coregit,Flareninja/Hispano-Pokemon-Showdown,Parukia/Pokemon-Showdown,Alpha-Devs/OmegaRuby-Server,yashagl/yash-showdown,SilverTactic/Dragotica-Pokemon-Showdown,ScottehMax/Pokemon-Showdown,LegendBorned/PS-Boilerplate,Kill-The-Noise/BlakJack-Boilerplate,azum4roll/Pokemon-Showdown,EmmaKitty/Pokemon-Showdown,TheFenderStory/Showdown-Boilerplate,SerperiorBae/Bae-Showdown-2,Tesarand/Pokemon-Showdown,UniversalMan12/Universe-Server,HoeenKid/Pokemon-Showdown-Johto,HoeenCoder/SpacialGaze,TheFenderStory/Pokemon-Showdown,kuroscafe/Showdown-Boilerplate,jd4564/Pokemon-Showdown,TheManwithskills/Server---Thermal,urkerab/Pokemon-Showdown,Darkshadow6/git-remote-add-scalingo-git-scalingo.com-pokemoonforums,Extradeath/psserver,PS-Spectral/Spectral,ShowdownHelper/Saffron,TheManwithskills/New-boiler-test,Kill-The-Noise/BlakJack-Boilerplate,SerperiorBae/Pokemon-Showdown-1,FakeSloth/Infinite,Firestatics/Firestatics46,TheManwithskills/serenity,sama2/Lumen-Pokemon-Showdown,hayleysworld/serenityc9,Celecitia/Plux-Pokemon-Showdown,SerperiorBae/Pokemon-Showdown,Git-Worm/City-PS,xCrystal/Pokemon-Showdown,MeliodasBH/boarhat,Yggdrasil-League/Yggdrasil,TheManwithskills/Server,KewlStatics/Shit,catanatron/pokemon-rebalance,Atwar/ServerClassroom,KewlStatics/Pokeindia-Codes,superman8900/Pokemon-Showdown,kupochu/Pokemon-Showdown,arkanox/MistShowdown,Pikachuun/Pokemon-Showdown-SMCMDM,BuzzyOG/Pokemon-Showdown,Flareninja/Pokemon-Showdown-1,ehk12/clone,k3naan/Pokemon-Showdown,xfix/Pokemon-Showdown,lFernanl/Zero-Pokemon-Showdown,SkyeTheFemaleSylveon/Pokemon-Showdown,ZestOfLife/PSserver,UniversalMan12/Universe-Server,FakeSloth/Infinite,Yggdrasil-League/Yggdrasil,ankailou/Pokemon-Showdown,TheManwithskills/Server,CreaturePhil/Showdown-Boilerplate,zek7rom/SpacialGaze,megaslowbro1/Showdown-Server-again,sama2/Universe-Pokemon-Showdown,SerperiorBae/PokemonShowdown2,panpawn/Pokemon-Showdown,AbsolitoSweep/Absol-server,jumbowhales/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,bai2/Dropp,PrimalGallade45/Lumen-Pokemon-Showdown,LegendBorned/PS-Boilerplate,KewlStatics/Showdown-Template,Nineage/Origin,TheManwithskills/Server-2,LightningStormServer/Lightning-Storm,Darkshadow6/PokeMoon-Creation,Darkshadow6/PokeMoon-Creation,Alpha-Devs/Alpha-Server,hayleysworld/asdfasdf,Guernouille/Pokemon-Showdown,johtooo/PS,KewlStatics/Alliance,InvalidDN/Pokemon-Showdown,xCrystal/Pokemon-Showdown,BadSteel/Pokemon-Showdown,lFernanl/Mudkip-Server,miahjennatills/Pokemon-Showdown,Stroke123/POKEMON,Hidden-Mia/Roleplay-PS,MayukhKundu/Pokemon-Domain,gustavo515/final,LightningStormServer/Lightning-Storm,DB898/theregalias,SerperiorBae/Bae-Showdown,gustavo515/batata,SerperiorBae/Pokemon-Showdown,SerperiorBae/Pokemon-Showdown-1,SkyeTheFemaleSylveon/Mudkip-Server,Mystifi/Exiled,DalleTest/Pokemon-Showdown,DarkSuicune/Pokemon-Showdown,Atwar/ServerClassroom,InvalidDN/Pokemon-Showdown,ehk12/clone,megaslowbro1/Pokemon-Showdown,Zarel/Pokemon-Showdown,BuzzyOG/Pokemon-Showdown,PrimalGallade45/Lumen-Pokemon-Showdown,Irraquated/Showdown-Boilerplate,Nineage/Showdown-Boilerplate,Celecitia/Plux-Pokemon-Showdown,Adithya4Uberz/The-Tsunami-League,Flareninja/Sora,BasedGod7/PH,BlakJack/Kill-The-Noise,Lord-Haji/SpacialGaze,svivian/Pokemon-Showdown,Wando94/Spite,scotchkorean27/Pokemon-Showdown,Kenny-/Pokemon-Showdown,TheManwithskills/serenity,ZestOfLife/PSserver,Ecuacion/Lumen-Pokemon-Showdown,Enigami/Pokemon-Showdown,urkerab/Pokemon-Showdown,forbiddennightmare/Pokemon-Showdown-1,Firestatics/omega,EienSeiryuu/Pokemon-Showdown,Firestatics/omega,KewlStatics/Shit,AvinashSwaminathan/Pokelegends,QuiteQuiet/Pokemon-Showdown,comedianchameleon/servertest1,sirDonovan/Pokemon-Showdown,KewlStatics/Pokeindia-Codes,yashagl/pokemon-showdown,Lord-Haji/SpacialGaze,TheManwithskills/Server-2,Sora-League/Sora,Adithya4Uberz/The-Tsunami-League,Sora-League/Sora,Lord-Haji/SpacialGaze,gustavo515/gashoro,SSJGVegito007/Vegito-s-Server,megaslowbro1/Pokemon-Showdown-Server-for-megaslowbro1,MayukhKundu/Flame-Savior,Raina4uberz/Light-server,gustavo515/test,TbirdClanWish/Pokemon-Showdown,TheManwithskills/Dusk--Showdown,kubetz/Pokemon-Showdown,SerperiorBae/Bae-Showdown,Sora-League/Sora,JellalTheMage/PS-,ShowdownHelper/Saffron,SubZeroo99/Pokemon-Showdown,Lauc1an/Perulink-Showdown,Irraquated/EOS-Master,xCrystal/Pokemon-Showdown,iFaZe/SilverZ,psnsVGC/Wish-Server,Pokemon-Devs/Pokemon-Showdown,LustyAsh/EOS-Master,Irraquated/Pokemon-Showdown,abrulochp/Lumen-Pokemon-Showdown,TheManwithskills/Server---Thermal,ShowdownHelper/Saffron,JellalTheMage/Jellals-Server,Legendaryhades/Oblivion,TbirdClanWish/Pokemon-Showdown,TheManwithskills/COC,NoahVSGamingYT/Pokemon-Showdown,cadaeic/Pokemon-Showdown,SerperiorBae/BaeShowdown,MayukhKundu/Mudkip-Server,hayleysworld/serenityc9,sirDonovan/Pokemon-Showdown,Psyientist/Showdown-Boilerplate,LightningStormServer/Lightning-Storm,Legit99/Lightning-Storm-Server,Darkshadow6/PokeMoon-Creation,Bryan-0/Pokemon-Showdown,hayleysworld/harmonia,QuiteQuiet/Pokemon-Showdown,Johto-Serverr/Werfin-Boilerplate,hayleysworld/Showdown-Boilerplate,johtooo/PS,DesoGit/Tsunami_PS,PauLucario/LQP-Server-Showdown,Ridukuo/Test,AustinXII/Pokemon-Showdown,AnaRitaTorres/Pokemon-Showdown,hayleysworld/Showdown-Boilerplate,PS-Spectral/Spectral,gustavo515/gashoro,Raina4uberz/Light-server,Wando94/Pokemon-Showdown,asdfghjklohhnhn/Pokemon-Showdown,Evil-kun/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,Hopenub/Pokemon-Showdown,DB898/theregalias,MayukhKundu/Pokemon-Domain,Kokonoe-san/Glacia-PS,AWailOfATail/Pokemon-Showdown,Evil-kun/Pokemon-Showdown,Syurra/Pokemon-Showdown,DesoGit/TsunamiPS