Made a personal VR. All of these placements are based on solely my own opinion. If I didn't include an ability, I may have just forgotten about it, but it is more likely that I know about it and chose not to mention it. The same goes for any Pokemon not here. Placements within tiers are in alphabetical order. A lot of these takes are going to be insane.
S Rank
S+

Blissey (Imposter, Innards Out, Wonder Guard)
S

Chansey (Imposter, Innards Out)
S-

Kartana (Huge Power, Magic Guard, No Guard, Prankster)

Mewtwo-Mega-Y (Innards Out, Magic Guard, No Guard, Protean, Psychic Surge, Wonder Guard)

Slaking (Harvest, Huge Power, Wonder Guard)

Yveltal (Huge Power, Magic Bounce, Magic Guard)
A Rank
A+

Arceus (Wonder Guard)

Gengar-Mega (Magic Guard, Mold Breaker No Guard, Parental Bond)

Mewtwo-Mega-X (Huge Power)

Regigigas (Huge Power, Wonder Guard)
A

Greninja-Ash (Huge Power, Mold Breaker, No Guard, Wonder Guard)

Groudon-Primal (Huge Power, Magic Guard, Mold Breaker, Prankster, Shadow Tag, Wonder Guard)

Kyurem-Black (Innards Out, Magic Bounce)

Kyurem-White (Innards Out, Magic Bounce)

Muk-Alola (Mold Breaker, Wonder Guard)

Steelix-Mega (Prankster)

Zygarde-Complete (Prankster)
A-

Deoxys-Speed (Mold Breaker, No Guard)

Diancie-Mega (Harvest?, Huge Power?, Pixilate)

Ferrothorn (Wonder Guard)

Heatran (Prankster?, Wonder Guard)

Lopunny-Mega (Huge Power?, No Guard)

Meloetta (Harvest???, Wonder Guard)

Pheromosa (Huge Power, Magic Guard, Mold Breaker, No Guard, Wonder Guard)

Rayquaza-Mega (Magic Guard, Mold Breaker, Shadow Tag)

Swampert-Mega (Wonder Guard)
B Rank
B+

Audino-Mega (Wonder Guard)

Deoxys-Attack (Magic Guard, Psychic Surge)

Gardevoir-Mega (Magic Guard, Wonder Guard)

Giratina-Origin (Harvest)

Gyarados-Mega (Magic Guard, Wonder Guard)

Lunala (Innards Out, Wonder Guard)

Metagross-Mega (No Guard)

Scizor-Mega (Wonder Guard)

Solgaleo (Fur Coat, No Guard)
B

Alakazam-Mega (Psychic Surge)

Banette-Mega (Huge Power)

Kyogre-Primal (Poison Heal?, Wonder Guard)

Necrozma-Dawn-Wings (Wonder Guard)

Necrozma-Dusk-Mane (Huge Power)

Necrozma-Ultra (Huge Power)

Slowbro-Mega (Fur Coat, Wonder Guard)
B-

Articuno (Magic Bounce)

Celesteela (Prankster, Primordial Sea, Wonder Guard)

Doublade (Fur Coat?, Magic Bounce, Primordial Sea)

Ho-Oh (Magic Bounce, Magic Guard, Prankster, Wonder Guard)

Lugia (Magic Bounce, Magic Guard, Prankster)

Marowak-Alola (Huge Power)

Pikachu (Imposter)

Sceptile-Mega (No Guard)

Xerneas (Innards Out, Mold Breaker)
C Rank

Excadrill (Innards Out)

Guzzlord (Innards Out)

Heracross-Mega (Huge Power)

Lucario-Mega (No Guard)

Registeel (Magic Bounce???)

Type: Null (Magic Bounce, Wonder Guard)
I will not be providing any explanations. If you disagree with any of my takes, you can contact me if you take your complaint to my secretary. Please message them
here.