oras uu viability ranks

S Rank

Mega Altaria
Mega Diancie
Jirachi
Klefki
Togekiss
Volcarona

A+ Rank
Mega Aerodactyl
Mega Alakazam
Mega Gallade
Mega Lopunny
Staraptor
Suicune
Swampert

A Rank

Mega Absol
Mega Aggron
Alakazam
Azelf
Mega Beedrill
Mega Blastoise
Celebi
Crobat
Empoleon
Krookodile
Lucario
Mienshao
Nidoqueen
Raikou
Shaymin
Tentacruel
Vaporeon
Zygarde

A- Rank

Bronzong
Chandelure
Donphan
Entei
Forretress
Gligar
Hydreigon
Infernape
Machamp
Nidoking
Roserade
Starmie
Mega Swampert
Umbreon

B+ Rank

Amoonguss
Mega Ampharos
Arcanine
Blissey
Cobalion
Dugtrio
Haxorus
Hippowdon
Florges
Mega Pidgeot
Rotom-Heat
Mega Sceptile
Mega Sharpedo
Snorlax
Yanmega
Whimsicott

B Rank

Mega Abomasnow
Alomomola
Aromatisse
Chesnaught
Darmanitan
Doublade
Dragalge
Fletchinder
Granbull
Honchkrow
Jellicent
Kyurem
Porygon-Z
Quagsire
Reuniclus
Rhyperior
Rotom-C
Sharpedo
Shuckle
Tornadus

B- Rank

Cresselia
Diancie
Escavalier
Flygon
Froslass
Galvantula
Magneton
Meloetta
Mismagius
Porygon-2
Slowking
Stoutland
Toxicroak
Virizion
Weezing

C Rank

Aerodactyl
Mega Audino
Mega Banette
Braviary
Mega Camerupt
Cloyster
Cofagrigus
Ditto
Drapion
Durant
Espeon
Exploud
Gastrodon
Mega Glalie
Golbat
Goodra
Heliolisk
Mega Houndoom
Kabutops
Kingdra
Milotic
Moltres
Noivern
Omastar
Shedinja
Slurpuff
Mega Steelix
Trevenant
Xatu
Zoroark

D rank: Reserved for Pokemon that are still in the UU tier, but are, simply put, ineffective in this meta.

Scrafty
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CHANGES

Mega Camerupt: Unranked --> C
Bronzong: B --> A-
Noivern: B --> C
Klefki: A+ --> S
Forretress: B+ --> A-
Donphan: B+ --> A-
Darmanitan: A- --> B+
Froslass: A- --> B-
Haxorus: B --> B+
Crobat: A- --> A