Counter that Pokémon!

[Nah]

Hitmonlee @ White Herb
Ability: Unburden
EVs: 252 Atk / 252 Spe / 4 Def
Adamant Nature
-Close Combat
-Knock Off
-Stone Edge
-Bulldoze

32 Atk Tyranitar Earthquake vs. 0 HP / 4 Def Hitmonlee: 157-185 (65.1 - 76.7%) -- guaranteed 2HKO

then outspeeds and OHKOs

 

[Raven Valt]

Gardevoir @ Gardevoirite
Timid Nature
Ability: Trace
EVs: 252 SpA / 4 SpD / 252 Spe
- Will-O-Wisp
- Psyshock
- Hyper Voice
- Focus Blast

252 SpA Gardevoir Psyshock vs. 0 HP / 4 Def Hitmonlee: 422-498 (175.1 - 206.6%) -- guaranteed OHKO

 

[Cid]

Jirachi @ Leftovers
Ability: Serene Grace
EVs: 248 HP / 188 SpD / 72 Spe
Careful Nature
- Rest
- Sleep Talk
- Iron Head
- Body Slam

 

[Raven Valt]

Houndoom @ Darkinium Z
Timid Nature
Ability: Flash Fire
EVs: 252 SpA / 4 SpD / 252 Spe
- Nasty Plot
- Fire Blast
- Dark Pulse
- Taunt

252 SpA Houndoom Inferno Overdrive (185 BP) vs. 248 HP / 188+ SpD Jirachi: 408-482 (101.2 - 119.6%) -- guaranteed OHKO after Leftovers recovery

 

[Cid]

Azumarill @ Normalium Z
Ability: Huge Power
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Belly Drum
- Aqua Jet
- Play Rough
- Knock Off

 

[Sirfetch’d]

Kartana @ Normalium Z
Ability: Beast Boost
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Leaf Blade
- Sacred Sword
- Giga Impact

can easily take a +6 Aqua Jet if Azu sets up on the switch and then outspeed and KO the following turn!

 

[Cid]

Doublade @ Eviolite
Ability: No Guard
EVs: 240 HP / 252 Atk / 16 SpD
IVs: 0 Spe
Brave Nature
- Swords Dance
- Gyro Ball
- Sacred Sword
- Shadow Sneak

 

[Raven Valt]

Alomomola @ Leftovers
Bold Nature
EVs: 40 HP / 252 Def / 216 SpD
- Wish
- Knock Off
- Protect
- Scald

 

[MelodicCodes]

Jolteon @ Life Orb
Modest Nature
Ability: Volt Absorb
EVs: 252 Spa / 252 Spe / 4 Spd
- Thunderbolt
- Volt Switch
- Hidden Power Ice
- Shadow Ball

 

[Cid]

Gastrodon @ Leftovers
Ability: Storm Drain
EVs: 248 HP / 8 Def / 252 SpD
Sassy Nature
- Scald
- Recover
- Toxic
- Earthquake

 

[Raven Valt]

Abomasnow @ Life Orb
Hasty Nature
Ability: Snow Warning
EVs: 4 Atk / 252 SpA / 252 Spe
- Blizzard
- Giga Drain
- Earthquake
- Ice Shard

 

[Cid]

Rotom-Heat @ Iapapa Berry
Ability: Levitate
EVs: 236 HP / 20 SpA / 252 Spe
Timid Nature
- Pain Split
- Volt Switch
- Overheat
- Toxic

 

[Raven Valt]

Gastrodon @ Leftovers
Ability: Storm Drain
EVs: 248 HP / 8 Def / 252 SpD
Sassy Nature
- Scald
- Recover
- Toxic
- Earthquake

(Yes I realise this is what Cid posted but I thought it was quite meme worthy to post it again)

 

[Cid]

Lmao you got me

Reuniclus @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 212 Def / 44 Spe
Bold Nature
- Calm Mind
- Psyshock
- Energy Ball
- Recover

 

[gimmepie]

Scizor @ Buginium Z
Ability: Technician
EVs: 244 HP / 16 Atk / 148 Def / 96 SpD / 4 Spe
Adamant Nature
- U-turn
- Bullet Punch
- Swords Dance
- Roost

 

[Cid]

Heatran @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 128 SpD / 128 Spe
Calm Nature
- Lava Plume
- Earth Power
- Taunt
- Toxic

 

[gimmepie]

Keldeo @ Choice Specs
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hydro Pump
- Scald
- Icy Wind
- Secret Sword

 

[Raven Valt]

Gardevoir @ Choice Scarf
Timid Nature
Ability: Trace
EVs: 4 Def / 252 SpA / 252 Spe
- Psyshock
- Moonblast
- Will-O-Wisp
- Healing Wish

 

[Nah]

Silvally-Steel @ Steel Memory
Ability: RKS System
EVs: 248 HP / 4 Atk / 240 SpD / 16 Spe
Lonely Nature
-Multi-Attack
-Flamethrower
-Ice Fang
-Toxic

4+ Atk burned Silvally-Steel Multi-Attack vs. 0 HP / 4 Def Gardevoir: 144-171 (51.9 - 61.7%) -- guaranteed 2HKO

Gardevoirs STABs have a hard time 4HKOing even with burn damage

 

[Raven Valt]

Swampert @ Leftovers
Relaxed Nature
Ability: Torrent
EVs: 252 HP / 252 Def / 4 SpD
- Stealth Rock
- Earthquake
- Scald
- Toxic

0 Atk Swampert Earthquake vs. 248 HP / 0 Def Silvally: 246-290 (62.5 - 73.7%) -- guaranteed 2HKO

4 Atk Silvally Multi-Attack vs. 252 HP / 252+ Def Swampert: 49-58 (12.1 - 14.3%) -- possibly the worst move ever