S rank

Tapu Lele
Genesect

A+ Rank

Ash Greninja
Tapu Koko
Landorus-T
Celesteela
Pheromosa
Buzzwole
Mega Metagross

A Rank

Garchomp
Heatran
Mega Scizor
Mega Alakazam
Greninja
Tapu Fini
Tapu Bulu
Ferrothorn
Rotom-W
Magearna
Hoopa-U
Excadrill
Latios
Manaphy


A- Rank

Mega Venusaur
Mega Charizard X
Mega Pinsir
Marowak-Alola
Gengar
Skarmory
Toxapex
Tyranitar (I'm torn on it going B+)
Zygarde
Zygarde 10%
Kartana
Clefable
Tornadus-T
Nihilego

B+ Rank

Mega Gyarados
Bisharp
Dugtrio
Mantine
Chansey
Starmie
Weavile
Jirachi
Thundurus
Magnezone
Mega Charizard-Y
Mega Sableye
Kyurem-B
Terrakion
Pelipper
Kingdra
Suicune
Tangrowth
Starmie
Amoonguss
Zapdos
Slowbro
Porygon-Z
Volcarona

B Rank

Mega Sharpedo
Muk Alolan
Mimikyu
Seperior
Salamence
Volcanion
Mamoswine
Hippowdon
Gyarados

B- Rank

Raichu Alolan
Ninetales Alolan
Dragonite


Shit I dont know where to rank:

Keldeo
Latias LOL
Regular Gyarados