Ok so here is the Official Metagamiate viability rankings created by me,
motherlove,
AllJokesAside,
Ghoul King,
Manchamp,
Chopin Alkaninoff,
OM room, and most of the OM community on PS!
Metagamiate Viability Rankings:
S-Rank:
Reserved for Pokemon who can sweep or wall significant portions of the metagame with little support, and Pokemon who can support other Pokemon with very little opportunity cost ("free turns"). Also the home of Pokemon who can easily perform multiple roles effectively, increasing their versatility and unpredictability. If the Pokemon in this rank have any flaws, those flaws are thoroughly mitigated by their substantial strengths.
Lucario
Medicham-Mega
Noivern
A-Rank:
Reserved for Pokemon who can sweep or wall significant portions of the metagame and can perform well against most play styles, but require some support or have some flaws that prevents them from doing this consistently. Supporting Pokemon in this rank may give opponents free turns or cannot create free turns easily themselves, but can still do their job most of the time.
A+
Arcanine
Gliscor
Metagross-Mega
Slowbro
Slowbro-Mega
Weavile
Zygarde
A
Azumarill
Chansey
Charizard-Mega X
Ferrothorn
Garchomp
Hoopa-U
Jirachi
Klefki
Landorus-T
Aerodactyl-Mega
Talonflame
Tyranitar
A-
Heatran
Mew
Salamence
Skarmory
Starmie
Tornadus-Therian
Thundurus-Incarnate
Venusaur-Mega
B-Rank:
Reserved for Pokemon who cannot sweep through or wall significant portions of the metagame, but can properly fulfill a given offensive/defensive niche. Support Pokemon in this category have flaws that prevent them from doing their job or are setup bait for dangerous sweepers. Pokemon who are partially outperformed by a Pokemon in A or S Rank, but are otherwise very dangerous, may also fall into this category.
B+
Azelf
Breloom
Gyarados
Hippowdon
Keldeo
Diancie-Mega
Sableye-Mega
Chesnaught
Staraptor
Togekiss
Tyranitar-Mega
Whimsicott
B
Bisharp
Clefable
Crawdaunt
Entei
Diancie
Exploud
Gengar
Latios
Lopunny-Mega
Sharpedo-Mega
Terrakion
Magnezone
Forretress
Quagsire
Rotom-Wash
Gardevoir
B-
Avalugg
Heracross
Latias
Pikachu
Porygon-Z
Swellow
Tentacruel
Zapdos
Omastar
C-Rank:
Reserved for Pokemon who can be effective in the right setting, but either have crippling flaws that prevent them from consistently executing their strategy or are completely eclipsed by a Pokemon in the above ranks.
C+
Blissey
Hitmontop
Luxray
Hitmonlee
Diggersby
Golem
C
Mr Mime
Crobat
Hariyama
Machamp
Suicune
Jellicent
Hawlucha
C-
Abomasnow
Bouffalant
Linoone
Banette-Mega
Cradily
Cloyster
D-Rank:
Reserved for Pokemon who have a small niche in the current metagame, but have very noticeable flaws that make them more trouble than they're worth the majority of the time. These Pokemon are, for the most part, unencouraged to use.
Shedinja
Gigalith
Conkeldurr
Pikachuun can you add to OP?
(still waiting for Noivern suspect...)
Discuss any changes you wish to make and we as a community will determine its validity.