The following posts list all of the tiers as of the current date in the thread title.
They will be updated roughly every month.
Each tier inherently contains the tiers below it (eg: OU contains BL, UU and NU)
Pokémon in indicated in bold have changed from last month's tier summary.
A * next to a pokémon indicates that it is a current suspect and may change tiers.
All Limbo Tier pokémon are considered suspects insomuch as Limbo is a temporary placement.
Über (21)
Arceus
Darkrai
Deoxys
Deoxys - Attack Form
Deoxys - Defence Form
Deoxys - Speed Form
Dialga
Garchomp
Giratina
Giratina - Origin Forme
Groudon
Ho-oh
Kyogre
Latios
Lugia
Manaphy *
Mew
Mewtwo
Palkia
Rayquaza
Shaymin - Sky Form
Wobbuffet
Wynaut
OU / Overused - Standard (49)
Aerodactyl
Alakazam
Azelf
Blissey
Breloom
Bronzong
Celebi
Cresselia
Donphan
Dragonite
Dugtrio
Dusknoir
Electivire
Empoleon
Flygon
Forretress
Gengar
Gliscor
Gyarados
Heatran
Heracross
Hippowdon
Infernape
Jirachi
Jolteon
Kingdra
Latias
Lucario
Machamp
Magnezone
Mamoswine
Metagross
Ninjask
Porygon-Z
Rhyperior
Salamence
Scizor
Skarmory
Smeargle
Snorlax
Starmie
Suicune
Swampert
Tentacruel
Togekiss
Tyranitar
Vaporeon
Weavile
Zapdos
BL / Borderline (5)
Abomasnow
Froslass
Gallade
Raikou
Staraptor
Limbo
This tier is a temporary placement. All pokémon in this tier are current suspects.
UU / Underused (57)
Underused includes all unevolved pokémon not listed in any of the above tiers.
Absol
Altaria
Ambipom
Arcanine
Azumarill
Blastoise
Blaziken
Chansey
Charizard
Claydol
Clefable
Crobat
Drapion
Electrode
Espeon
Feraligatr
Gardevoir
Hariyama
Hitmonlee
Hitmontop
Honchkrow
Houndoom
Kabutops
Lanturn
Ludicolo
Magmortar
Mesprit
Milotic
Miltank
Mismagius
Moltres
Muk
Nidoking
Nidoqueen
Ninetales
Omastar
Poliwrath
Porygon2
Primeape
Regirock
Registeel
Roserade
Rotom
Sceptile
Scyther
Shaymin
Slowbro
Spiritomb
Steelix
Swellow
Torterra
Toxicroak
Typhlosion
Umbreon
Uxie
Venusaur
Yanmega
Weezing
NU / Neverused (144)
Aggron
Ampharos
Arbok
Ariados
Armaldo
Articuno
Banette
Bastiodon
Beautifly
Beedrill
Bellossom
Bibarel
Butterfree
Cacturne
Camerupt
Carnivine
Castform
Chatot
Cherrim
Chimecho
Cloyster
Corsola
Cradily
Crawdaunt
Delcatty
Delibird
Dewgong
Ditto
Dodrio
Drifblim
Dunsparce
Dustox
Entei
Exeggutor
Exploud
Farfetch'd
Fearow
Flareon
Floatzel
Furret
Gastrodon
Girafarig
Glaceon
Glalie
Golduck
Golem
Gorebyss
Granbull
Grumpig
Hitmonchan
Huntail
Hypno
Illumise
Jumpluff
Jynx
Kangaskhan
Kecleon
Kingler
Kricketune
Lapras
Leafeon
Ledian
Lickilicky
Linoone
Lopunny
Lumineon
Lunatone
Luvdisc
Luxray
Magcargo
Manectric
Mantine
Marowak
Masquerain
Mawile
Medicham
Meganium
Mightyena
Minun
Mothim
Mr.Mime
Noctowl
Octillery
Pachirisu
Parasect
Pelipper
Persian
Phione
Pidgeot
Pinsir
Plusle
Politoed
Probopass
Purugly
Quagsire
Qwilfish
Raichu
Rampardos
Rapidash
Raticate
Regice
Relicanth
Sableye
Sandslash
Seaking
Seviper
Sharpedo
Shedinja
Shiftry
Shuckle
Skuntank
Slaking
Slowking
Solrock
Spinda
Stantler
Sudowoodo
Sunflora
Swalot
Tangrowth
Tauros
Torkoal
Tropius
Unown
Ursaring
Venomoth
Vespiquen
Victreebel
Vileplume
Volbeat
Wailord
Walrein
Whiscash
Wigglytuff
Womadam (all forms)
Xatu
Zangoose