ok i'm gonna pull up the viability thread real quick
S Rank: Reserved for Pokemon that are amazing in the OU metagame. These Pokemon are usually able to perform a variety of roles effectively, or can just do one extremely well. Their use has low risk involved and high reward exerted. Pokemon in this rank have very few flaws that are patched up by numerous positive traits.
Azumarill loses to knock off
Charizard (Mega-X) lol
Keldeo loses to HP flying
Landorus- loses to knock off
Thundurus- beats most common set, but has many variations that beat sehdinja
A Rank: Reserved for Pokemon that are fantastic in the OU metagame, and can sweep, support, or wall significant portions of the metagame. These Pokemon require less support than most others to be used effectively and have few flaws that can easily be compensated for when compared to their positive traits.
A+ Rank
Charizard (Mega-Y) lol
Clefable flamethrower
Excadrill rock slide
Ferrothorn leech seed
Greninja hp fire
Gyarados (Mega) beats every variation
Heatran lol
Heracross (Mega) rock blast
Landorus-T knock off/rock slide
Latias loses to HP fire
Latios read latias
Pinsir (Mega) lol
Talonflame lol
Terrakion lol
Venusaur (Mega) loses to HP fire/leech seed
A Rank
Bisharp lol
Dragonite loses to fire punch
Garchomp stone edge/fire blast
Gardevoir (Mega) can taunt you, but you can beat it 1v1(assuming no SR)
Gengar shadow ball
Gliscor toxic
Mamoswine sets SR so you can't beat its teammates
Medicham (Mega) gotta give you this one
Mew wisp/knock off
Rotom-W wisp
Scizor (Mega) knock off
Tyranitar sets sand
Tyranitar (Mega) sets sand
A- Rank
Amoonguss foul play/hp fire
Breloom spores you/rock tomb
Chansey well anything can wall this lol
Diggersby you win
Gyarados bounce from sub wins
Hippowdon sets sand
Kyurem-B teravolt
Mandibuzz foul play/toxic
Skarmory can't touch you but can't touch anything
Slowbro has coverage to beat you
B Rank: Reserved for Pokemon that are great in the OU metagame. These Pokemon have more notable flaws than those above them that affect how they function in the tier. Their positive traits still outshine their negatives, but they require a bit more team support to bring out their full potential.
B+ Rank
Aerodactyl (Mega) lol
Alakazam (Mega) shadow ball/hp fire
Alomomola toxic
Kabutops rock stab
Magnezone runs HP fire
Manaphy you win here
Manectric (Mega) overheat
Politoed eh you win here but always has kabutops/omastar as a teammate
Quagsire toxic
Scolipede bps out/rock slide
Starmie you win
Suicune stalls you out
Tornadus-T knock off
Victini v-create kills literal thousands of shedinjas in one hit
B Rank
Celebi eh you win
Garchomp (Mega) fire blast
Kingdra eh you win
Raikou shadow ball
Scizor pursuit
Staraptor brave bird kills thousands of shedinjas in one hit
Zapdos heat wave
B- Rank
Ampharos (Mega) mold breaker
Chesnaught leech seed
Conkeldurr knock off
Entei lol fire
Gothitelle traps+hp fire
Lucario wins if crunch
Rhyperior obliterates
Sableye knock off/wisp
Weavile lol