Do you want to make a NU team? Don't know an idea of what Pokemon to use? Are you sure you want to use that Arbok? Then you've come to the right place! For your convienence, I've posted the 3rd generation tier list, since we've only listed the ubers.
Credit goes to Smogon.com....
TIER 1: UBER
Deoxys
Deoxys-fr
Deoxys-lg
Deoxys-e
Groudon
Ho-oh
Kyogre
Latias
Latios
Lugia
Mew
Mewtwo
Rayquaza
Wobbuffet
TIER 2: STAPLE
Blissey
Celebi
Gyarados
Heracross
Jirachi
Metagross
Salamence
Skarmory
Snorlax
Suicune
Swampert
Tyranitar
TIER 3: STANDARD
Aerodactyl
Alakazam
Donphan
Dragonite
Dugtrio
Dusclops
Gengar
Jolteon
Magneton
Medicham
Milotic
Raikou
Sceptile
Slaking
Starmie
Vaporeon
Weezing
Zapdos
TIER 4: COMMON
Armaldo
Blaziken
Breloom
Claydol
Dodrio
Entei
Exeggutor
Flygon
Gardevoir
Hariyama
Machamp
Marowak
Miltank
Ninjask
Porygon2
Regice
Regirock
Slowbro
Tauros
Umbreon
Venusaur
TIER 5: BORDERLINE UNDERUSED
Altaria
Arcanine
Articuno
Blastoise
Charizard
Clefable
Cloyster
Cradily
Crobat
Electabuzz
Espeon
Forretress
Golem
Hitmonlee
Houndoom
Jumpluff
Kangaskhan
Kingdra
Lanturn
Lapras
Ludicolo
Muk
Moltres
Mr. Mime
Poliwrath
Quagsire
Registeel
Rhydon
Smeargle
Steelix
Swellow
Ursaring
Zangoose
TIER 6: GOOD UNDERUSED
Absol
Ampharos
Azumarill
Banette
Cacturne
Camerupt
Fearow
Gligar
Golduck
Gorebyss
Grumpig
Hitmontop
Huntail
Jynx
Linoone
Lunatone
Magmar
Meganium
Nidoking
Nidoqueen
Omastar
Piloswine
Pinsir
Primeape
Sandslash
Shedinja
Shiftry
Solrock
Tentacruel
Typhlosion
Victreebel
Vileplume
Walrein
Yanma
TIER 7: AVERAGE UNDERUSED
Aggron
Ariados
Bellossom
Dunsparce
Exploud
Feraligatr
Flareon
Girafarig
Granbull
Hitmonchan
Hypno
Kabutops
Kecleon
Misdreavus
Octillery
Persian
Raichu
Scizor
Scyther
Slowking
Swalot
Tangela
Xatu
TIER 8: POOR UNDERUSED
Arbok
Dewgong
Electrode
Glalie
Kingler
Manectric
Mantine
Ninetales
Noctowl
Parasect
Pidgeot
Politoed
Qwilfish
Rapidash
Raticate
Seviper
Stantler
Sudowoodo
Torkoal
Whiscash
Wigglytuff
TIER 9: BARELY USABLE
Crawdaunt
Farfetch'd
Furret
Lickitung
Nosepass
Relicanth
Seaking
Sableye
Sharpedo
Shuckle
Sneasel
Sunflora
Tropius
Venomoth
Wailord
TIER 10: CRAP
Aipom
Beautifly
Beedrill
Butterfree
Castform
Chimecho
Corsola
Delcatty
Delibird
Dustox
Illumise
Ledian
Magcargo
Masquerain
Mawile
Mightyena
Minun
Murkrow
Pelipper
Plusle
Roselia
Spinda
Togetic
Volbeat
TIER 11: UNDESERVING OF MENTION
Ditto
Luvdisc
Unown
Credit goes to Smogon.com....
TIER 1: UBER
Deoxys
Deoxys-fr
Deoxys-lg
Deoxys-e
Groudon
Ho-oh
Kyogre
Latias
Latios
Lugia
Mew
Mewtwo
Rayquaza
Wobbuffet
TIER 2: STAPLE
Blissey
Celebi
Gyarados
Heracross
Jirachi
Metagross
Salamence
Skarmory
Snorlax
Suicune
Swampert
Tyranitar
TIER 3: STANDARD
Aerodactyl
Alakazam
Donphan
Dragonite
Dugtrio
Dusclops
Gengar
Jolteon
Magneton
Medicham
Milotic
Raikou
Sceptile
Slaking
Starmie
Vaporeon
Weezing
Zapdos
TIER 4: COMMON
Armaldo
Blaziken
Breloom
Claydol
Dodrio
Entei
Exeggutor
Flygon
Gardevoir
Hariyama
Machamp
Marowak
Miltank
Ninjask
Porygon2
Regice
Regirock
Slowbro
Tauros
Umbreon
Venusaur
TIER 5: BORDERLINE UNDERUSED
Altaria
Arcanine
Articuno
Blastoise
Charizard
Clefable
Cloyster
Cradily
Crobat
Electabuzz
Espeon
Forretress
Golem
Hitmonlee
Houndoom
Jumpluff
Kangaskhan
Kingdra
Lanturn
Lapras
Ludicolo
Muk
Moltres
Mr. Mime
Poliwrath
Quagsire
Registeel
Rhydon
Smeargle
Steelix
Swellow
Ursaring
Zangoose
TIER 6: GOOD UNDERUSED
Absol
Ampharos
Azumarill
Banette
Cacturne
Camerupt
Fearow
Gligar
Golduck
Gorebyss
Grumpig
Hitmontop
Huntail
Jynx
Linoone
Lunatone
Magmar
Meganium
Nidoking
Nidoqueen
Omastar
Piloswine
Pinsir
Primeape
Sandslash
Shedinja
Shiftry
Solrock
Tentacruel
Typhlosion
Victreebel
Vileplume
Walrein
Yanma
TIER 7: AVERAGE UNDERUSED
Aggron
Ariados
Bellossom
Dunsparce
Exploud
Feraligatr
Flareon
Girafarig
Granbull
Hitmonchan
Hypno
Kabutops
Kecleon
Misdreavus
Octillery
Persian
Raichu
Scizor
Scyther
Slowking
Swalot
Tangela
Xatu
TIER 8: POOR UNDERUSED
Arbok
Dewgong
Electrode
Glalie
Kingler
Manectric
Mantine
Ninetales
Noctowl
Parasect
Pidgeot
Politoed
Qwilfish
Rapidash
Raticate
Seviper
Stantler
Sudowoodo
Torkoal
Whiscash
Wigglytuff
TIER 9: BARELY USABLE
Crawdaunt
Farfetch'd
Furret
Lickitung
Nosepass
Relicanth
Seaking
Sableye
Sharpedo
Shuckle
Sneasel
Sunflora
Tropius
Venomoth
Wailord
TIER 10: CRAP
Aipom
Beautifly
Beedrill
Butterfree
Castform
Chimecho
Corsola
Delcatty
Delibird
Dustox
Illumise
Ledian
Magcargo
Masquerain
Mawile
Mightyena
Minun
Murkrow
Pelipper
Plusle
Roselia
Spinda
Togetic
Volbeat
TIER 11: UNDESERVING OF MENTION
Ditto
Luvdisc
Unown