Counter that Pokémon! SM v.2

[Sirfetch’d]

Volcarona @ Psychium Z
Ability: Flame Body
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Quiver Dance
- Fire Blast
- Hidden Power [Ground]
- Psychic

 

[LatiasSoulDew]

Zygarde @ Choice Band
Ability: Aura Break
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Thousand Arrows
- Extreme Speed
- Outrage
- Toxic

 

[PlatinumDude]

Zygarde @ Choice Band
Ability: Aura Break
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Thousand Arrows
- Extreme Speed
- Outrage
- Toxic

Not really a counter because a Shattered Psyche followed by normal Psychic has the potential to KO. That, and Volcarona naturally outspeeds Zygarde for this chance. If Volcarona Quiver Dances as Zygarde switches in, a boosted Shattered Psyche can either damage it severely, if not OHKO it:

252 SpA Volcarona Shattered Psyche (175 BP) vs. 4 HP / 0 SpD Zygarde: 205-242 (57.2 - 67.5%) -- guaranteed 2HKO

252 SpA Volcarona Psychic vs. 4 HP / 0 SpD Zygarde: 106-125 (29.6 - 34.9%) -- 12.8% chance to 3HKO

+1 252 SpA Volcarona Shattered Psyche (175 BP) vs. 4 HP / 0 SpD Zygarde: 306-361 (85.4 - 100.8%) -- 6.3% chance to OHKO

Countering Volcarona:

Goodra:

-Draco Meteor
-Fire Blast
-Sludge Wave
-Rock Slide
Nature: Quiet
EVs: 252 HP/252 SAtk/4 SDef
Item: Assault Vest
Ability: Sap Sipper

Goodra laughs at anything Volcarona can throw at it, even a boosted Shattered Psyche.

 

[Sirfetch’d]

Umbreon @ Leftovers
Ability: Synchronize
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
- Wish
- Protect
- Heal Bell
- Foul Play

 

[Mobile Tsk]

Glalie @ Choice Specs
Ability: Ice Body
252 HP / 252 Def / 4 SpA
Bold Nature | IVs: 0 Atk
- Switcheroo
- Disable
- Hail
- Blizzard

 

[wolf]

Glaceon @ Choice Specs
Ability: Ice Body
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
- Blizzard
- Shadow Ball
- Hidden Power Fighting
- Water Pulse

 

[Sirfetch’d]

Volcanion @ Choice Specs
Ability: Water Absorb
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Steam Eruption
- Fire Blast
- Sludge Wave
- Earth Power

 

[Kostas]

Hydreigon @ Choice Specs
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Draco Meteor
- Dark Pulse
- Flash Cannon
- Fire Blast

 

[wolf]

Primarina @ Choice Specs
Ability: Torrent
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
- Hydro Pump
- Moonblast
- Psychic
- Hidden Power Fire

 

[gimmepie]

Chansey @Eviolite
Ability: Natural Cure
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
-Toxic
-Stealth Rock
-Soft-Boiled
-Seismic Toss

 

[Parivir]

Lopunny @ Lopunnite
Ability: Limber
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Return
- High Jump Kick
- Power-Up Punch
- Ice Punch

 

[wolf]

Slowbro @ Slowbronite
Ability: Regenerator
EVs: 252 HP / 216 Def / 40 SpD
Bold Nature
- Scald
- Calm Mind
- Slack Off
- Psyshock

 

[gimmepie]

Tapu Bulu @Choice Band
Ability: Grassy Surge
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
-Wood Hammer
-Horn Leach
-Superpower
-Stone Edge

Slowbro 3HKOs (or 2HKOs off of one Calm Mind) whilst Bulu outspeeds and OHKOs with Wood Hammer.

 

[Kostas]

Venusaur @ Venusaurite
Ability: Chlorophyll
EVs: 248 HP / 88 Def / 156 SpD / 16 Spe
Calm Nature
- Giga Drain
- Sludge Bomb
- Synthesis
- Hidden Power Fire

 

[wolf]

Spiritomb @ Black Glasses
Ability: Infiltrator
EVs: 212 HP / 252 Atk / 44 Spe
Adamant Nature
- Pursuit
- Sucker Punch
- Shadow Sneak
- Will-O-Wisp

 

[Sirfetch’d]

Wigglytuff @ Life Orb
Ability: Competitive
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Stealth Rock
- Hyper Voice
- Dazzling Gleam
- Fire Blast

 

[gimmepie]

Nihilego @Choice Scarf
Ability: Choice Scarf
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
-Sludge Wave
-Power Gem
-Hidden Power Fire
-Thunderbolt

 

[Kostas]

Magearna @ Assault Vest
Ability: Soul-Heart
EVs: 200 HP / 56 SpA / 252 SpD
Calm Nature
- Fleur Cannon
- Flash Cannon
- Hidden Power Fire
- Volt Switch

 

[HeroLinik]

Marowak-Alola @ Thick Club
Ability: Lightning Rod
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Shadow Bone
- Fire Punch
- Swords Dance
- Stealth Rock

 

[wolf]

Drampa @ Choice Specs
Ability: Berserk
EVs: 252 HP / 4 Def / 252 SpA
Modest Nature
- Hyper Voice
- Draco Meteor
- Flamethrower
- Focus Blast