Grass - Amoongus
Bug - Crustle
Normal - Meloetta
Water - Rotom-W
Psychic - Hoopa-U
Ice - Kyurem-B
Dragon - Kyurem-B, Kyurem, Altarinite
Poison - Naganadel
Fighting - Hawlucha, Galladite
Fire - Cameruptite
Potential Suspect List:
Normal - Lopunnite
Fighting - Medichamite
Grass - Abomasite
Initial Viability Rankings:
Bug:
S - Mega Pinsir, Volcarona
A - Wormadam-T, Armaldo
B - Shuckle, Vivillon, Silvally-Bug
C - Ribombee, Escavalier, Dwebble, Mega Scizor, Mega Heracross
Dark:
S - Scrafty, Greninja
A - Malamar, Incineroar, Hydreigon
B - Krookodile, Muk-Alola, Crawdaunt, Mega Tyranitar
C - Bisharp, Pangoro, Umbreon
Dragon:
S - Haxorus, Naganadel
A - Kommo-o, Salamence
B - Latios, Zygarde
C - Goodra, Hydreigon
Electric:
S - Electivire, Stunfisk
A - Togedemaru, Mega Manectric
B - Raichu-Alola, Xurkitree, Eelektross, Rotom-W
C - Golem-Alola, Zeraora
Fairy:
S - Mawile, Tapu Koko
A - Whimsicott, Clefairy
B - Primarina, Mega Diancie
C - Tapu Lele, Tapu Bulu, Ribombee
Fighting:
S - Scrafty, Keldeo
A - Gallade, Mega Medicham, Hitmontop
B - Kommo-o, Emboar, Mega Lucario, Lucario
C - Machamp, Infernape, Mienshao
Fire:
S - Volcarona
A - Mega Houndoom, Infernape
B - Incineroar, Victini, Camerupt, Torkoal, Marowak-Alola
C - Arcanine, Mega Blaziken, Mega Charizard Y, Mega Charizard X
Flying:
S - Thundurus-Therian, Landorus-Therian
A - Togekiss, Celesteela, Salamence, Minior
B - Shaymin-Sky, Zapdos, Aerodactyl
C - Vivillon, Staraptor, Gliscor
Ghost:
S - Hoopa, Mega Banette
A - Blacephalon, Mega Gengar
B - Spiritomb, Cofagrigus, Marowak-Alola
C - Gengar, Aegislash, Sableye, Drifblim
Grass:
S - Mega Abomasnow
A - Celebi, Tangrowth, Whimsicott, Ferrothorn
B - Ludicolo, Breloom, Carnivine, Virizion
C - Shaymin-Sky, Abomasnow, Mega Venusaur, Kartana
Ground:
S - Mega Camerupt
A - Claydol, Mamoswine, Gastrodon
B - Mega Swampert, Landorus-Therian
C - Torterra, Garchomp, Krookodile, Zygarde
Ice:
S - Sandslash-Alola, Ninetales-Alola
A - Kyurem, Beartic
B - Crabominable, Aurorus, Weavile, Mamoswine
C - Jynx, Regice, Glaceon
Normal:
S - Oranguru, Exploud
A - Porygon2, Bewear, Mega Lopunny
B - Porygon Z, Drampa, Persian
C - Staraptor, Ambipom, Lopunny, Kangaskhan
Poison:
S - Venomoth, Nidoking, Salazzle
A - Mega Venusaur, Amoonguss, Nidoqueen
B - Muk-Alola, Crobat
C - Toxicroak, Roserade
Psychic:
S - Meloetta
A - Hoopa, Oranguru, Deoxys-A, Mega Metagross
B - Mega Alakazam, Mega Slowbro, Meowstic
C - Malamar, Victini, Bruxish, Necrozma, Cresselia
Rock:
S - Stakataka, Terrakion
A - Lunatone, Solrock, Barbaracle, Rhyperior
B - Carracosta, Kabutops, Diancie, Mega Diancie, Aggron
C - Aerodactyl, Rampardos, Cradily
Steel:
S - Heatran
A - Mega Lucario, Togedemaru, Cobalion, Mega Steelix, Kartana
B - Mega Aggron, Mega Metagross, Empoleon
C - Magnezone, Ferrothorn, Celesteela, Genesect
Water:
S - Kingdra, Keldeo
A - Qwilfish, Ludicolo, Politoed
B - Lanturn, Mega Gyarados, Suicune, Jellicent
C - Mega Blastoise, Azumarill, Pelipper