Offical Pokemon Battle Tiers

For those who don't know tournament qualified pokemon, here's the tier list:

Uber
Ubers are too strong for standard play and thus have their own tier. Their use is restricted solely to Uber designated battles.

Arceus
Darkrai
Deoxys
Deoxys - E
Deoxys - F
Deoxys - L
Dialga
Giratina
Groudon
Ho-Oh
Kyogre
Latias
Latios
Lugia
Mew
Mewtwo
Palkia
Rayquaza
Wobbuffet
Wynaut


Over-Used
OU pokemons are the most commonly found and the strongest in regular play.

Aerodactyl
Alakazam
Arcanine
Azelf
Blissey
Bronzong
Celebi
Claydol
Cresseria
Donphan
Dragonite
Dugtrio
Dusknoir
Electivire
Garchomp
Gengar
Gliscor
Gyarados
Heatran
Heracross
Hippowdon
Infernape
Jirachi
Jolteon
Lucario
Machamp
Magnezone
Manaphy
Mamoswine
Medicham
Metagross
Milotic
Ninjask
Porygon-Z
Raikou
Regice
Rhyperior
Salamence
Skarmory
Slaking
Slowbro
Snorlax
Staraptor
Starmie
Suicune
Swampert
Togekiss
Tyranitar
Umbreon
Weavile
Weezing
Zapdos


Borderline
BL pokemons are too strong for MU and may be found in some OU battles. They are classified as BL because they simply do not have the capacity to compete in solid OU consistently.

Abomasnow
Ambipom
Armaldo
Articuno
Blaziken
Breloom
Charizard
Cradily
Crobat
Drapion
Empoleon
Entei
Feraligatr
Flygon
Forretress
Gallade
Hariyama
Kingdra
Lapras
Leafeon
Ludicolo
Magmortar
Mesprit
Miltank
Moltres
Ninetales
Pinsir
Rampardos
Regirock
Registeel
Roserade
Sceptile
Scizor
Shaymin
Steelix
Tangrowth
Tauros
Torterra
Uxie
Vaporeon
Venusaur
Zangoose


Moderately-Used
MU pokemons fell from BL and moved up from UU. It is a class of misplaced monsters. They are not recommended for use outside of their tier.

Absol
Aggron
Bastiodon
Blastoise
Cacturne
Clefable
Cloyster
Dodrio
Drifblim
Dunsparce
Espeon
Exeggutor
Floatzel
Gardevoir
Glaceon
Golduck
Golem
Grumpig
Hitmonchan
Hitmonlee
Houndoom
Jumpluff
Jynx
Kabutops
Kangaskhan
Kingler
Lanturn
Lickilicky
Luxray
Marowak
Meganium
Muk
Mismagius
Omastar
Nidoqueen
Nidoking
Octillery
Poliwrath
Probopass
Rapidash
Regigigas
Sharpedo
Shiftry
Slowking
Smeargle
Spiritomb
Swellow
Tentacruel
Toxicroak
Typhlosion
Ursaring
Vespiquen
Victreebel
Walrein
Yanmega


Under-Used
The UU tier designates pokemons whose use is limited as they are not strong enough for general MU, or above, competition. UU monsters are recommended solely for UU type battles.

Altaria
Ampharos
Arbok
Azumarill
Banette
Bellossom
Camerupt
Carnivine
Cherrim
Crawdaunt
Electrode
Fearow
Flareon
Froslass
Gastrodon
Girafarig
Gorebyss
Granbull
Hitmontop
Honchkrow
Hypno
Kecleon
Linoone
Lopunny
Lumineon
Lunatone
Manectric
Mantine
Wormadam - Grs
Wormadam - Rk
Wormadam - Stl
Mr. Mime
Persian
Pikachu
Politoed
Primeape
Purugly
Quagsire
Qwilfish
Raichu
Raticate
Relicanth
Rotom
Sableye
Sandslash
Scyther
Seviper
Shedinja
Shuckle
Solrock
Stantler
Skuntank
Swalot
Wailord
Whiscash
Wigglytuff
Vileplume
Xatu


Never-Used
The NU teir is for pokemons that have problems competing even in UU. They are recommended only for use only designated NU battles.

Ariados
Beautifly
Beedrill
Bibarel
Butterfree
Castform
Chatot
Chimecho
Corsola
Delcatty
Delibird
Dewgong
Ditto
Dustox
Exploud
Farfetch'd
Furret
Glalie
Huntail
Illumise
Kricketune
Ledian
Luvdisc
Magcargo
Masquerain
Mawile
Mightyena
Minun
Mothim
Noctowl
Pachirisu
Parasect
Pelipper
Phione
Pidgeot
Plusle
Seaking
Spinda
Sudowoodo
Sunflora
Torkoal
Tropius
Unown
Venomoth
Volbeat