Counter that Pokémon! SM v.2

Aggron @ Aggronite
Ability: Sturdy
EVs: 252 HP / 16 Def / 240 SpD
Impish Nature
- Stealth Rock
- Roar
- Heavy Slam
- Earthquake

+6 252 Atk Life Orb Mimikyu Shadow Sneak vs. 252 HP / 16+ Def Aggron-Mega: 114-136 (33.1 - 39.5%) -- 100% chance to 3HKO

+6 252 Atk Life Orb Mimikyu Play Rough vs. 252 HP / 16+ Def Aggron-Mega: 127-151 (36.9 - 43.8%) -- guaranteed 3HKO

+6 252 Atk Life Orb Mimikyu Wood Hammer vs. 252 HP / 16+ Def Aggron-Mega: 113-134 (32.8 - 38.9%) -- 99.5% chance to 3HKO

0 Atk Aggron-Mega Heavy Slam (120 BP) vs. 0 HP / 0 Def Mimikyu: 416-492 (165.7 - 196%) -- guaranteed OHKO

EDIT: IDK if Aggronite has actually been released yet, but for the purpose of this thread, I am going to pretend it is 8D

Sableye @ Sablenite
Ability: Prankster
252 HP / 252 Def / 4 SpD
Careful Nature
- Knock Off
- Protect
- Will-O-Wisp
- Recover

Sableye can block Roar/SR, cripple Aggron with a burn and easily stall it out.

Primarina @ Choice Specs
Ability: Torrent
172 HP / 252 SpA / 84 Spe
Modest Nature
- Hydro Pump
- Moonblast
- Psychic
- HP Fire

Mew @ Leftovers
Ability: Synchronize
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Taunt
- Soft-Boiled
- Will-O-Wisp
- Knock Off

252+ SpA Choice Specs Primarina Hydro Pump vs. 252 HP / 252+ SpD Mew: 210-247 (51.9 - 61.1%) -- 94.9% chance to 2HKO after Leftovers recovery

Mew tanks this hit fairly well and then outspeeds and Knocks Off the Specs the second turn:

252+ SpA Primarina Hydro Pump vs. 252 HP / 252+ SpD Mew: 139-165 (34.4 - 40.8%) -- 54.5% chance to 3HKO after Leftovers recovery

Mew then proceeds to recover enough health to use Will-O-Wisp. After that Mew then begins to stall with Softboiled recovery.

Heracross @ Choice Band
Ability: Guts
252 HP / 252 Atk / 4 Spe
- Knock Off
- Megahorn
- Close Combat
- Stone Edge

Granbull @ Leftovers
Ability: Intimidate
EVs: 252 HP / 252 Atk / 4 Def
Adamant Nature
- Play Rough
- Heal Bell
- Earthquake
- Thunder Wave

Granbull can switch in and easily tank a few hits after Intimidate and then OHKO with Play Rough.

-1 252+ Atk Choice Band Heracross Close Combat vs. 252 HP / 4 Def Granbull: 131-155 (34.1 - 40.3%) -- 42.2% chance to 3HKO after Leftovers recovery

-1 252+ Atk Choice Band Heracross Stone Edge vs. 252 HP / 4 Def Granbull: 147-173 (38.2 - 45%) -- guaranteed 3HKO after Leftovers recovery

252+ Atk Granbull Play Rough vs. 252 HP / 4 Def Heracross: 386-456 (106 - 125.2%) -- guaranteed OHKO

Charizard @ Choice Specs
Ability: Blaze
252 HP / 4 Def / 252 SpA
Modest Nature
- Fire Blast
- Air Slash
- Hidden Power Ice
- Focus Blast

Tapu Fini @ Choice Specs
Ability: Misty Surge
EVs: 84 HP / 252 SpA / 172 Spe
Modest Nature
IVs: 0 Atk
- Hydro Pump
- Ice Beam
- Hidden Power [Electric]
- Moonblast

Tried to think of something more creative. Couldn't lol

Ferrothorn @ Leftovers
Ability: Iron Barbs
252 HP / 4 Def / 252 SpD
Sassy Nature
- Leech Seed
- Protect
- Power Whip
- Gyro Ball

Torkoal @ Heat Rock
Ability: Drought
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
-Lava Plume
-Solar Beam
-Toxic
-Rapid Spin

really all I need is a fire type lol

Pelipper @ Damp Rock
Ability: Drizzle
EVs: 248 HP / 196 Def / 64 SpD
Bold Nature
- Scald
- Hurricane
- U-turn
- Roost

Gets rid of the sun with Drizzle which makes Lava Plume do less than it already would and makes Solar Beam a charge up move. Easily wins with Scald.

Again, I fail to see the next page. I'm so hopeless.

Lanturn @ Assault Vest
Ability: Volt Absorb
EVs: 252 SpA / 132 SpD / 124 Spe
Modest Nature
- Scald
- Volt Switch
- Ice Beam
- Hidden Power Fire

there we go

Quagsire @ Leftovers
Ability: Unaware
252 HP / 4 Def / 252 SpD
Sassy Nature
- Recover
- Earthquake
- Scald
- Toxic

Serperior @ Leftovers
Ability: Contrary
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Leaf Storm
- Hidden Power Fire
- Dragon Pulse
- Glare

One or Two Leaf Storms and Quagsire goes bye-bye.

Bouffalant @ Assault Vest
Ability: Sap Sipper
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- Return
- Earthquake
- Megahorn
- Facade

Doublade @ Eviolite
Ability: No Guard
EVs: 252 HP / 4 Atk / 252 SpD
Sassy Nature
- Gyro Ball
- Toxic
- Sleep Talk
- Rest

252+ Atk Choice Band Reckless Staraptor Brave Bird vs. 252 HP / 0 Def Eviolite Doublade: 85-101 (26.3 - 31.3%) -- guaranteed 4HKO

4 Atk Doublade Gyro Ball (111 BP) vs. 0 HP / 4 Def Staraptor: 174-205 (55.9 - 65.9%) -- guaranteed 2HKO

Torkoal @ Life Orb
Ability: Drought
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Shell Smash
- Fire Blast
- Earth Power
- Rapid Spin

Leafeon @ Choice Band
Ability: Leaf Guard
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Bullet Seed
- Leaf Blade
- Knock Off
- Double-Edge

Skarmory @ Flyinium Z
Ability: Weak Armor
EVs: 232 HP / 252 Atk / 24 Spe
Adamant Nature
- Swords Dance
- Iron Head
- Brave Bird
- Pursuit

Mawile @ Mawilite
Ability: Intimidate
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Swords Dance
- Iron Head
- Play Rough
- Fire Fang