Counter that Pokémon

Rotom-H w/Leftovers
Nature: Calm
Ability: Levitate
EVs: 248 HP, 8 Defense, 252 Sp.Defense
Moves: Overheat, Thunderbolt, Will-o-Wisp, Pain Split

The Easy-Bake Oven on crack hardly notices Magnezone's attacks since it resists them and has good special bulk, and can turn it to slag via Overheat, followed by a Thunderbolt to finish it.

Haxorus @ Lum Berry
Ability: Mold Breaker
EVs: 252 Spd / 252 Atk / 4 HP
Adamant Nature
- Dragon Dance
- Dragon Claw
- Earthquake
- Poison Jab

Haxorus resists all of Rotom-H's attacks and can strike back with a SE Earthquake. The lum berry is there so Haxorus isn't burned.

Slayr231 said:

Haxorus @ Lum Berry
Ability: Mold Breaker
EVs: 252 Spd / 252 Atk / 4 HP
Adamant Nature
- Dragon Dance
- Dragon Claw
- Earthquake
- Poison Jab

Haxorus resists all of Rotom-H's attacks and can strike back with a SE Earthquake. The lum berry is there so Haxorus isn't burned.

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Easy-Bake Oven has Levitate, so Earthquake doesn't work. However:

252+ Atk Haxorus Dragon Claw vs. 248 HP / 8 Def Rotom-H: 148-175 (48.8 - 57.7%) -- 56.3% chance to 2HKO after Leftovers recovery
0 SpA Rotom-H Overheat vs. 0 HP / 0 SpD Haxorus: 97-115 (33.1 - 39.2%) -- 100% chance to 3HKO

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So Haxorus still wins. Just not via EQ.

Ignore this post.

...Totally getting a Rotom-H now and naming it Easy-Bake Oven.

^Haxorus gets Mold Breaker, so earthquake will hit the easy bake oven.

Slayr231 said:

Haxorus @ Lum Berry
Ability: Mold Breaker
EVs: 252 Spd / 252 Atk / 4 HP
Adamant Nature
- Dragon Dance
- Dragon Claw
- Earthquake
- Poison Jab

Haxorus resists all of Rotom-H's attacks and can strike back with a SE Earthquake. The lum berry is there so Haxorus isn't burned.

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Suicune @ Leftovers
Ability: Pressure
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Rest
- Sleep Talk
- Surf
- Ice Beam

Physically defensive Suicune counters Haxorus very well. It can take EQ and Dragon Claws nicely, even after a DD.

252+ Atk Haxorus Earthquake vs. 252 HP / 252+ Def Suicune: 86-102 (21.2 - 25.2%) -- possible 5HKO after Leftovers recovery
252+ Atk Haxorus Dragon Claw vs. 252 HP / 252+ Def Suicune: 103-123 (25.4 - 30.4%) -- 0.9% chance to 4HKO after Leftovers recovery

+1 252+ Atk Haxorus Earthquake vs. 252 HP / 252+ Def Suicune: 129-152 (31.9 - 37.6%) -- 0.1% chance to 3HKO after Leftovers recovery
+1 252+ Atk Haxorus Dragon Claw vs. 252 HP / 252+ Def Suicune: 154-183 (38.1 - 45.2%) -- guaranteed 3HKO after Leftovers recovery

Then Suicune can 2HKO Haxorus with Ice Beam, even with no investment in SpA.

0 SpA Suicune Ice Beam vs. 0 HP / 0 SpD Haxorus: 158-188 (53.9 - 64.1%) -- guaranteed 2HKO

Roserade has enough bulk to take Ice Beam from Suicune, then hit back with Leaf Storm for an OHKO. Sludge Bomb also can hit for a 2HKO:

0 SpA Suicune Ice Beam vs. 252 HP / 4 SpD Roserade: 114-136 (35.1 - 41.9%) -- guaranteed 3HKO
252+ SpA Choice Specs Roserade Leaf Storm vs. 252 HP / 4 SpD Suicune: 600-708 (148.5 - 175.2%) -- guaranteed OHKO
252+ SpA Choice Specs Roserade Sludge Bomb vs. 252 HP / 4 SpD Suicune: 208-246 (51.4 - 60.8%) -- 92.6% chance to 2HKO after Leftovers recovery


Roserade @ Choice Specs
Ability: Natural Cure
EVs: 252 SAtk / 252 HP / 4 SDef
Modest Nature
- Leaf Storm
- Sludge Bomb
- Hidden Power [Fire]
- Extrasensory

Heatran @ Assault Vest
Ability: Flash Fire
EVs: 252 SAtk / 252 HP / 4 SDef
Modest Nature
- Fire Blast / Flamethrower
- Earth Power
- Dark Pulse
- Hidden Power [Ice]

Heatran ohkos with Fire Blast or Flamethrower. Roserade can't even retaliate because Heatran is immune to two of its moves while the other two moves deals around ~15% damage at best.

Blissey (F) @ Leftovers
Ability: Natural Cure
EVs: 252 SDef / 252 HP / 4 Def
Careful Nature
- Seismic Toss
- Soft-Boiled
- Thunder Wave
- Stealth Rock

The best at walling any special set. Blissey just heals off any damage and continues to use Seismic Toss until Heatran goes bye-bye.

Machamp w/ Lum Berry
Ability: No Guard
Nature: Adamant
212 HP / 252 Atk / 44 Spe
~ Rest
~ Sleep Talk
~ DynamicPunch
~ Stone Edge

Machamp should be able to endure a Thunder Wave thanks to Lum Berry, then keep DynamicPunching Blissey until it's down and out.

Aegislash:

-Swords Dance
-Autotomize
-Shadow Claw
-Sacred Sword
Nature: Adamant
EVs: 88 HP/252 Atk/168 Spe
Item: Leftovers

Aegislash walls Machamp's current moves and uses it setup bait for Swords Dance and Autotomize.

Gotta whip this thing out:


-Zygarde w/Leftovers (last I checked, Zygarde isn't Ubers, so its good)
Nature: Impish
Ability: Aura Break
EVs: 252 HP, 252 Defense, 4 Attack
Moves: Earthquake, Coil, Stone Edge, Extreme Speed

+2 252+ Atk Aegislash-Blade Sacred Sword vs. 252 HP / 252+ Def Zygarde: 151-178 (35.9 - 42.3%) -- 92.8% chance to 3HKO after Leftovers recovery

+2 252+ Atk Aegislash-Blade Shadow Claw vs. 252 HP / 252+ Def Zygarde: 177-208 (42.1 - 49.5%) -- guaranteed 3HKO after Leftovers recovery

It's pretty obvious that Earthquake will OHKO Aegislash, and since it can take a couple of +2 attacks and not die, I'd say this is a counter.

Quagsire @ Leftovers
Bold
248 HP / 156 Def / 104 SpA
Unaware

Scald
Ice Beam / Encore
Recover
Toxic

Unaware ignores anything Zygarde gains from Coil. From there, Quagsire can either Toxic stall it out with Recover, Burn it with Scald so as to further limit its offensive capabilities, or lock it into Coil with Encore. Ice Beam is a simple 2HKO after Leftovers with the 104 SpA EV's invested.

104 SpA Quagsire Ice Beam vs. 252 HP / 0 SpD Zygarde: 224-264 (53.3 - 62.8%) -- guaranteed 2HKO after Leftovers recovery

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4 Atk Zygarde Earthquake vs. 248 HP / 156+ Def Quagsire: 96-114 (24.4 - 29%) -- possible 5HKO after Leftovers recovery

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4 Atk Zygarde Extreme Speed vs. 248 HP / 156+ Def Quagsire: 51-61 (12.9 - 15.5%) -- possibly the worst move ever

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4 Atk Zygarde Stone Edge vs. 248 HP / 156+ Def Quagsire: 32-38 (8.1 - 9.6%) -- possibly the worst move ever

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Breloom @ Toxic Orb
Ability: Poison Heal
Nature: Adamant
EVs: 12 HP / 252 Atk / 244 Spe
- Substitute
- Focus Punch
- Spore
- Seed Bomb

Resists Scald, and can Spore or Seed Bomb to get rid of Quagsire.

Tangrowth @ Leftovers
Ability: Regenerator
Nature: Bold
EVs: 252 HP / 252 Def / 4 SAtk
- Giga Drain
- Focus Blast
- HP Ice
- Synthesis

I use Tangrowth against opposing Breloom all the time and hardly anything else works better. Being immune to spore this gen, Tangrowth can (and will) take any punch the karate mushroom can dish out while healing off the damage with Synthesis and striking back with a deadly HP Ice.

Delphox:

-Fire Blast
-Psyshock
-Grass Knot
-Switcheroo
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Scarf
Ability: Blaze

Delphox resists all of Tangrowth's current moves. It also hits it hard with Fire Blast or cripples it with Switcheroo.

Garchomp @ Garchompite
16 Atk/252 Sp. Atk/240 Speed
Hasty nature
- Swords Dance
- Draco Meteor
- Earthquake
- Stone Edge

Should be able to take down Delphox with an Earthquake or two. If it manages to set-up Swords Dance, though, then it's a guaranteed one-hit knockout.

Bronzong @ Leftovers
Ability: Levitate
EVs: 252 SDef / 252 HP / 4 Atk
Sassy Nature
IVs: 0 Spd
- Toxic
- Stealth Rock
- Earthquake
- Gyro Ball

Bronzong either resists or is immune to all of Garchomp's attacks. Then Garchomp gets to be toxic'd and just worn down by Bronzong until it goes bye-bye.

Volcarona @ Lum Berry
Ability: Flame Body
Nature: Modest
EVs: 252 SpA / 4 SpD / 252 Spe
- Quiver Dance
- Bug Buzz
- Fiery Dance
- Giga Drain

Volcarona Doesn't mind Gyro Ball or EQ, and Toxic won't matter much.

Dragonite (M) @ Choice Band
Trait: Multiscale
EVs: 4 HP / 252 Atk / 252 Spd
Adamant Nature (+Atk, -SAtk)
- Outrage
- Earthquake
- Extreme Speed
- Fire Punch

252+ Atk Choice Band Dragonite Outrage vs. 0 HP / 0 Def Volcarona: 468-552 (150.4 - 177.4%) -- guaranteed OHKO

+1 252+ SpA Volcarona Bug Buzz vs. 4 HP / 0 SpD Multiscale Dragonite: 62-73 (19.1 - 22.5%) -- possible 5HKO
+1 252+ SpA Volcarona Fiery Dance vs. 4 HP / 0 SpD Multiscale Dragonite: 55-65 (16.9 - 20%) -- possible 5HKO

Porygon2 @ Eviolite
252 HP / 252 Def / 4 SpD
Ability: Trace
Nature: Bold
~ Recover
~ Thunderbolt
~ Ice Beam
~ Thunder Wave

It copies Dragonite's Multiscale ability thanks to Trace, allowing it to take an additional hit or two. After that, it cripples Dragonite down with Thunder Wave and keeps using Ice Beam until its HP reaches zero.