S rank
Zapdos (Drizzle)
Thundurus-I (Sheer Force or Prankster)
Landorus-T (intimidate or mold breaker)
Garchomp (Swift Swim)

A+ Rank
Mega Alakazam (Pure Power) (+ Superpower)
Tornadus-I (Sheer Force)
Mega Gengar (assuming unbanned) (Cursed Body) (+ Parting Shot)
Mamoswine (Skill Link)
Gengar (Insomnia) (+ Parting Shot)
Aegislash (stance change standard)
Ferrothorn (Rain Dish / Iron Barbs)
Slowbro (Unaware or Regenerator)
Mega Gallade (Sheer Force)
Latios-Mega (adaptability)

A Rank
Slaking (Stall)
Mew (Protean)
Scizor (Hustle)
Kabutops (swift Swim or Tough Claws)
Terrakion (quick feet)
Keldeo (Torrent)
Swampert (Poison Heal)
Ludicolo (Huge Power)
Bisharp (Defiant)
Mega Ampharos (Speed Boost) (+ Dragon Dance)
Tyranitar (Rough Skin or Sand Stream)
Hippodown (Thick Fat)
Metagross (Magnet Pull)
Landorus-I (Sheer Force or Defiant)
Mega Gyarados (strong Jaw)
Mega Gallade (Sheer Force)

A- Rank
Nidoking (Parental Bond)
Mega Altaria (Multiscale -> Fairy Aura) (+ Lovely Kiss)
Tangrowth (Poison heal)
Lucario (Mega Launcher)
Mega Tyranitar (Mold Breaker)
Skarmory (Overcoat)
Latias (Synchronize / Levitate)
Latias-Mega (Marvel Scale)
Weavile (Dark Aura)
Haxorus (Intimidate)
Clefable (Prankster or Magic Guard)
Mega Charizard X (Multiscale)

B+ Rank
Mega Blastoise (Solid Rock) (+ Slack Off)
Raikou (Competitive)
Kyurem-B (Clear Body)
Cresselia (Natural Cure)
Latios (Synchronize)
Mandibuzz (Oblivious)
Mega Gardevoir (Magic Bounce)
Zoroark (Protean)
Mega Banette (Shadow Tag) (+ Drain Punch)
Tyrantrum (Moxie)
Togekiss (Pixilate)

B Rank
Mega Pidgeot (Gale Wings)
Moltres (drought)
Rhydon (Multiscale)
Pinsir-Mega (Hustle) (+ Hone Claws)
Arcanine (Sheer Force)
Entei (Defiant)
Staraptor (Moxie)
Virizion (Chloryphyll)
Mr. Mime (Prankster)
Mega Houndoom (Dark Aura)
Swanna (Gale Wings)
Manaphy (Rain Dish)
Escavalier (regenerator)
Accelgor (Tinted Lens)
Hawlucha (adaptability)
Absol-Mega (Defiant) (+ Sacred Sword)

B- Rank
Umbreon (Filter)
Thundurus-T (Unburden)
Mega Beedrill (Technician)
Gliscor (Sand Stream)
Rampardos (Sand Rush)
Braviary (Guts)
Mega Kangaskhan (Iron Fist) (+ Mach Punch)
Volcarona (Heatproof)
Blazkien (Reckless)
Mega Sceptile (Technician)
Celebi (Pixilate / Natural Cure)
Dusklops (Intimidate)
Darmanitan-Zen (Sheer Force)
Meloetta (Download)

C+ Rank
Espeon (Tinted Lens)
Forretress (Heatproof)
Delphox (magic Guard)
Pyroar (female) (Sheer Force)
Musharna (Magic Bounce)
Zangoose (Tough Claws)
Audino (Unaware)
Flareon (fur Coat)
Rhyperior (Sand Force)
Tornadus-T (Unburden)
Quagsire (Sap Sipper)
Milotic (Adaptability)
Dusknoir (Intimidate)
Farfetch’d (Huge Power)
Darmanitan (Flame Body)
Mega Manectric (Speed Boost -> Soundproof)

C Rank
Mega Charizard Y (Flame Body)
Sylveon (Serene Grace)
Yanmega (Aerilate)
Mega Scizor (Battle Armor)
Snorlax (Guts)
Mega Heracross (No Guard) (+ Circle Throw)
Shuckle (Mold Breaker)
Sawk (Scrappy)
Mega Aggron (Motor Drive) (+ Heat Crash)
Steelix-Mega (Sand Stream) (+Diamond Storm)
Mega Audino (Magic Guard)

C- Rank
Venusaur-Mega (Dry Skin)
Glaceon (Refrigerate)
Lucario-Mega (Guts)
Dewgong (Fur Coat)
Stoutland (Hustle)

D rank
Leafeon (Natural Cure)

Slow Start Magikarp Rank
Magikarp (Slow Start)