The Official Alter Universe tier List

Uber

Arceus
Darkrai
Deoxys Deffense Attack and Normal
Dialga
Giratina Normal and Orgin
Groudon
Ho-Oh
Kyogre
Latias
Latios
Lugia
Mewtwo
Palkia
Rayquaza
Wobbuffet


OU

Aerodactyl
Alakazam
Ambipom
Arcanine
Articuno
Azelf
Blissey
Breloom
Bronzong
Celebi
Cradily
Cressilia
Donaphan
Dragonite
Dusknoir
Electivire
GARCHOMP
Gengar
Gliscor
Gyarados
Heatran
Heracross
Hippowdon
Infernape
Jirachi
Jolteon
Lucario
Magenzone
Metagross
Mew (thinking of putting uber though)
Milotic
Ninjask
Porygon-Z
Raichu
Regigigas
Rhyperior
Salamence
Scizor
Shaymin Sky Form
Skarmory
Slaking
Slowbro
Starmie
Suicune
Swampert
Tangrowth
Tauros
Togekiss
Tyranitar
Umbreon
Vaporeon
Weavile
Weezing
Yanmega
Zapdos