Azumarill - Either STAB
Charizard (Mega-X) - Earthquake, but Dragon STAB already hits super hard
Keldeo - Either STAB
Landorus - Earth Power, Focus Blast , Psychic
Thundurus - Focus Blast, Psychic
A+ Rank
Charizard (Mega-Y) - Solarbeam, Focus Blast
Clefable - Moonblast
Excadrill - Earthquake, Iron Head
Garchomp - Earthquake, Dragon STAB hits really hard
Greninja - Hydro Pump, Extrasensory, HP Grass
Gyarados (Mega) - Waterfall, Earthquake
Heatran - Earth Power, Flash Cannon
Latias - Psyshock, Surf
Latios - Psyshock, Surf
Pinsir (Mega) - Close Combat, Earthquake, Return hits really hard too
Talonflame - None, but Brave Bird hits super hard
Terrakion - Close Combat
Tyranitar (Mega) - Earthquake, Superpower
Venusaur (Mega) - Giga Drain
A Rank
Bisharp - Iron Head
Dragonite - Earthquake, Dragon STAB hits really hard
Ferrothorn - Power Whip, Gyro Ball
Gardevoir (Mega) - Hyper Voice, Focus Blast, Psyshock
Gengar - Focus Blast, Terrakion also hates Will-O-Wisp
Gliscor - Earthquake
Heracross (Mega) - Close Combat
Hippowdon - Earthquake
Landorus-T - Earthquake
Mamoswine - Earthquake
Medicham (Mega) - High Jump Kick, Drain Punch, Zen Headbutt, Bullet Punch
Mew - Psyshock, also threatens with Will-O-Wisp
Rotom-W - Hydro Pump, Will-O-Wisp
Scizor (Mega) - Bullet Punch, Superpower
Tyranitar - Earthquake, Superpower
A- Rank
Amoonguss - Giga Drain
Breloom - Mach Punch, Bullet Seed
Chansey - None, but paralysis really sucks
Diggersby - Earthquake
Gyarados - Waterfall, Earthquake
Kyurem-B - Earth Power
Manaphy - Surf, Scald, Grass Knot, Psychic
Mandibuzz - Terrakion actually switches in here really well!
Skarmory - Terrakion switches in easily, but threatened by Counter if it can't KO
Slowbro - Scald, Psyshock
B+ Rank
Alomomola - Scald
Garchomp (Mega) - Earthquake, Dragon STAB still hurts
Kabutops - Waterfall
Politoed - Scald, Hydro Pump
Quagsire - Scald, Earthquake
Scizor - Bullet Punch, Superpower
Scolipede - Earthquake
Suicune - Scald
Tornadus-T - Focus Blast, Superpower
B Rank
Aerodactyl (Mega) - Earthquake, Aqua Tail
Alakazam (Mega) - Psyshock, Focus Blast
Kingdra - Surf, Hydro Pump
Lucario - Close Combat, Iron Tail
Magnezone - Flash Cannon
Manectric (Mega) - HP Grass is pretty rare, so Terrakion can switch in decently. Still gets 2HKOed by Thunderbolt, though.
Raikou - Extrasensory, but otherwise same as Mega Manectric.
Starmie - Hydro Pump, Scald, Psyshock
Victini - Zen Headbutt, Brick Break, CB V-Create still really hurts, Will-O-Wisp
Zapdos - None, Terrakion comes in nicely here
B- Rank
Absol (Mega) - Superpower
Ampharos (Mega) - Focus Blast
Celebi - Giga Drain, Psychic
Chesnaught - Hammer Arm, Wood Hammer
Entei - Bulldoze, Sacred Fire burns also suck
Gothitelle - Psyshock
Rhyperior - Earthquake
Sableye - Will-O-Wisp
Staraptor - Close Combat, Brave Bird still hurts
Weavile - Low Kick