Counter that Pokémon

Druddigon

-Stealth Rock
-Dragon Tail
-Earthquake
-Glare
Nature: Careful
EVs: 252 HP/4 Def/252 SDef
Item: Leftovers/Rocky Helmet
Ability: Rough Skin

Druddigon uses its Dragon typing and heavy investment in special bulk to tank every move Manectric has and threatens it with paralysis from Glare, a supereffective Earthquake or the forced switch from Dragon Tail.

Landorus-T @ Leftovers
Trait: Intimidate
EVs: 200 HP / 84 Atk / 224 Def
Adamant Nature

- Earthquake
- Stone Edge
- U-turn
- Stealth Rock

Dragon Tail deals very low damage thanks to the Defense EVs and Intimidate ability, and because of its additional Flying type it won't be affected by Spikes, which means each time it gets phazed it only loses 12.5% health provided Stealth Rock is on its field. Meanwhile, Earthquake is a guaranteed 2HKO with 84 Attack EVs.

Bronzong @ Leftovers
Levitate
EVs: 252 HP / 252 Def / 4 SpD / 0 Speed IVs
Relaxed Nature
Gyro Ball
Stealth Rock
Toxic
HP Ice / Explosion

A standard set, as far as things go (except for maybe HP Ice / Explosion). Earthquake doesn't affect me, Stone Edge does virtually nothing thanks to my huge defense stats, I'm not gonna take massive damage from Stealth Rock, and U-Turn won't do a whole ton either. In return, I can do any number of things - Toxic, set up my own Stealth Rocks, Gyro Ball or HP Ice (probably the logical choice on this set).

Chandelure @ Choice Scarf
252 SpA / 4SpD / 252Spe
Flash Fire
Timid Nature
- Fire Blast
- Shadow Ball
- Energy Ball
- HP Fighting

Takes nothing at all from any move Bronzong can possibly throw at it, and can OHKO back with Fire Blast.

Snorlax (F) @ Choice Band
Trait: Thick Fat
EVs: 252 Atk / 52 Def / 200 SDef / 4 Spd
Adamant Nature (+Atk, -SAtk)
- Return
- Pursuit
- Earthquake
- Crunch

252 SpA Chandelure Hidden Power Fighting vs. 0 HP / 200 SpD Snorlax: 128-152 (27.76 - 32.97%) -- guaranteed 4HKO
Fire Blast: 17.78 - 21.04%

252+ Atk Choice Band Snorlax Earthquake vs. 4 HP / 0 Def Chandelure: 350-412 (133.58 - 157.25%) -- guaranteed OHKO

Machamp @ Leftovers / Sitrus Berry
No Guard
Adamant
EVs: 212 HP / 252 Atk / 44 Spe
Bulk Up
DynamicPunch
Stone Edge
ThunderPunch

Thanks to a huge attack stat for Machamp (especially if you Bulk Up) and a not-so-huge defense stat for Snorlax, Snorlax is gonna get slaughtered.

Without Bulk Up
252+ Atk Machamp DynamicPunch vs. 0 HP / 52 Def Snorlax: 474-558 (102.81 - 121.04%) -- guaranteed OHKO

Calcs done without Bulk Up and/or Leftovers / Sitrus Berry
252+ Atk Choice Band Snorlax Return vs. 212 HP / 44 Def Machamp: 279-328 (74.59 - 87.7%) -- guaranteed 2HKO
252+ Atk Choice Band Snorlax Earthquake vs. 212 HP / 44 Def Machamp: 182-215 (48.66 - 57.48%) -- 51.56% chance to 2HKO
252+ Atk Choice Band Snorlax Earthquake vs. 212 HP / 44 Def Machamp: 182-215 (48.66 - 57.48%) -- 51.56% chance to 2HKO
252+ Atk Choice Band Snorlax Crunch vs. 212 HP / 44 Def Machamp: 73-86 (19.51 - 22.99%) -- possible 6HKO

So, as you can see, Snorlax gets murdered by DynamicPunch from Machamp without Bulk Ups. If you want to Bulk Up once and let Machamp's HP drop, Sitrus Berry (if chosen) activates, bringing Machamp's HP back up (if you don't have a Sitrus Berry, Leftovers still gets some HP back). DynamicPunch, Snorlax is gone and Machamp is at 50% HP and +1 Atk / Def. Simple enough.

Golurk:

-Earthquake
-Shadow Punch
-Ice Punch
-Drain Punch
Nature: Adamant
EVs: 80 HP/252 Atk/176 Spe
Item: Choice Band
Ability: Iron Fist

Golurk is immune to DynamicPunch and ThunderPunch and can take a Stone Edge. Band-boosted Earthquakes will hurt Machamp a lot.

Gyarados w/Lum Berry
Ability: Moxie
Adamant nature
252 Atk / 4 Def / 252 Spe
~ Dragon Dance
~ Waterfall
~ Bounce
~ Earthquake

Gyarados is a lot faster than Golurk, so it would always be the one to strike the first move. Gyarados' defensive stats aren't totally bad, so it should be able to endure an attack or two that the opponent throws at it. The first thing Gyarados would do is use Dragon Dance. This would raise its Attack and Speed stats, and enable it to land stronger attacks. When it's done, it would use Waterfall, which would take out Golurk with a single hit. Thanks to Moxie, this would raise his Attack once more, allowing it to get through any Pokémon that the opponent manages to send out on the field. If you're able to utilize Gyarados the right way, then you'll be winning the match in an instant. (:

Jolteon
252 sp.atk/4 sp.def/252 spe
Timid nature @Life orb
-Thunder/Thunderbolt
-Hidden Power Ice
-Shadow Ball
-Signal Beam

Any electric attack completely destroys Gyarados, and Jolteon is one of the best ways to counter Gyarados. It out speeds Gyarados and can just set off an electric type move with its impressive base 110 special attack stat (most likely Thunder because normally Gyarados is in the rain)

Victreebel's Bro said:

Jolteon
252 sp.atk/4 sp.def/252 spe
Timid nature @Life orb
-Thunder/Thunderbolt
-Hidden Power Ice
-Shadow Ball
-Signal Beam

Any electric attack completely destroys Gyarados, and Jolteon is one of the best ways to counter Gyarados. It out speeds Gyarados and can just set off an electric type move with its impressive base 110 special attack stat (most likely Thunder because normally Gyarados is in the rain)

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Jolteon gets OHKO'd if it switches into Waterfall or Earthquake. Jolteon is only a check, not a counter. Please read the OP for more details.

Perdition Haze said:

Gyarados w/Lum Berry
Ability: Moxie
Adamant nature
252 Atk / 4 Def / 252 Spe
~ Dragon Dance
~ Waterfall
~ Bounce
~ Earthquake

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Suicune @ Leftovers
Trait: Pressure
EVs: 252 SAtk / 4 SDef / 252 Spd
Timid Nature (+Spd, -Atk)
- Hydro Pump
- Calm Mind
- Ice Beam
- Hidden Power [Electric]

252+ Atk Gyarados Bounce vs. 0 HP / 0 Def Suicune: 132-156 (38.7 - 45.74%) -- guaranteed 3HKO

252 SpA Suicune Hidden Power Electric vs. 0 HP / 0 SpD Gyarados: 240-284 (72.5 - 85.8%) -- guaranteed 2HKO

Abomasnow@Leftovers
248HP / 92Def / 40SpAtk / 96SpDef / 32Spd
Quiet nature
- Wood Hammer
- Leech Seed
- Blizzard
- Substitute

Hard walls Suicune basically, sets up a sub and can use wood hammer and leech seed to stall it and defeat it, evs outspeeds Blissey.

Entei @ Choice Band
252 Atk / 4 SpA / 252 Spe
Adamant Nature
- Flare Blitz
- ExtremeSpeed
- Stone Edge
- Hidden Power Grass

Suicune @ Leftovers
Trait: Pressure
EVs: 252 HP / 252 Def / 4 SDef
Bold Nature (+Def, -Atk)
- Calm Mind
- Rest
- Sleep Talk
- Surf

252+ Atk Choice Band Entei Stone Edge vs. 252 HP / 252+ Def Suicune: 107-127 (26.48 - 31.43%) -- possible 4HKO
HP Grass: 18.31 - 21.78%

0 SpA Suicune Surf vs. 0 HP / 0 SpD Entei: 236-282 (63.61 - 76.01%) -- guaranteed 2HKO

Ludicolo@Leftovers
252 hp / 40 Def / 216 Sp.Def
Calm Nature
- Leech Seed
- Protect
- Giga Drain
- Scald

Hard walls cune. Giga Drain, Leech Seed and 4x resistance to its STAB move.

Bouffalant @leftovers
Sap Sipper
156 HP / 252 Atk / 100 Spe
Adamant Nature
- Substitute
- Head Charge
- Earthquake
- Swords Dance

As far as KOing is concerned, the best Ludicolo can do is a 5hko with Scald. If afro thing catches a lucky Grass-type move, a +1 Atk Head Charge is a ohko. Otherwise, it's a 2hko.

Abomasnow @ Choice Band
252 HP / 252 Atk / 4 Spe
Adamant Nature
- Ice Shard
- Wood Hammer
- Earthquake
- Avalanche / Focus Punch

Can tank anything Ludicolo has (except unlucky Scald burn) and will cleanly OHKO with Wood Hammer after SR.

Edit: Greninjaed

Zeffy said:

Bouffalant @leftovers
Sap Sipper
156 HP / 252 Atk / 100 Spe
Adamant Nature
- Substitute
- Head Charge
- Earthquake
- Swords Dance

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Gengar (M) @ Leftovers
Trait: Levitate
EVs: 4 Def / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Sludge Bomb
- Shadow Ball
- Focus Blast
- Hidden Power [Fire]

Gengar can safely switch in to any of Bouffalant's offensive moves and proceed to 3HKO it with Sludge Bomb.

Zeffy said:

Bouffalant @leftovers
Sap Sipper
156 HP / 252 Atk / 100 Spe
Adamant Nature
- Substitute
- Head Charge
- Earthquake
- Swords Dance

As far as KOing is concerned, the best Ludicolo can do is a 5hko with Scald. If afro thing catches a lucky Grass-type move, a +1 Atk Head Charge is a ohko. Otherwise, it's a 2hko.

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If Scald burns then you lose. ;(

Jin Of The Gale said:

Gengar (M) @ Leftovers
Trait: Levitate
EVs: 4 Def / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Sludge Bomb
- Shadow Ball
- Focus Blast
- Hidden Power [Fire]

Gengar can safely switch in to any of Bouffalant's offensive moves and proceed to 3HKO it with Sludge Bomb.

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Blissey@Leftovers
252 Def / 112 Sp.Atk / 52 Sp.Def / 92 Speed
Calm Nature
Trait: Natural Cure
- Wish
- Protect
- Toxic
- Flamethrower

Focus Blast: 27.3% - 32.3%

Evs outspeed Scizor.

Machamp (F) @ Lum Berry
Trait: No Guard
EVs: 212 HP / 252 Atk / 44 Spd
Adamant Nature (+Atk, -SAtk)
- Ice Punch
- DynamicPunch
- Stone Edge
- Payback

Slowbro @Choice Specs
Trait: Regenerator OR Own Tempo
EVs: 252 HP / 4 Def / 252 SpA
Modest nature
- Psychic
- Surf / Hydro Pump
- Fire Blast
- Ice Beam

Own Tempo is good to avoid Dynamic Punch confusion.

Dark Azelf said:

If Scald burns then you lose. ;(

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I've completely forgotten about that haha. I suppose the set has 30% fatality rate then