Zeffy said:

Counter that Pokémon! - Generation 7 Edition

Information

With the release of Gen 7, I thought it'd be great to bring back a classic game! Counter that Pokémon is essentially what it says--someone posts a Pokémon, the next person tries to counter the Pokémon, and then the next person tries to counter that Pokémon and so on and so forth! This is a fun way to test your overall game knowledge as well as to learn some of the crafty ways other people tries to counter certain threats.​

Rules

• The game requires you to post an appropriate counter to the Pokémon, not just a simple check. Learn the difference between a counter and a check by reading this in-depth explanation from Smogon. Failure to follow this rule will result in your post being called out, so keep this in mind!
• As mentioned in the previous rule, if the previous poster fails to post a valid counter, you should call them out and post an appropriate counter to what they were countering.
• OU Pokémon and below only, please. Ubers and above can counter almost anything due to their sheer power.
• Assume that everything is one-on-one, so don't factor in entry hazard damage or luck-based strategies such as confusion.
• Do not slash information into your Pokémon's moveset. This completely defeats the purpose of the game since you can't alter your Pokémon's moveset in an actual battle.
• Try to post your set in a readable format. You can use Pokémon Showdown's export feature to easily create a readable moveset format.

Useful Resources

• Pokémon Showdown's Damage Calculator
• Smogon

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Nidoking @ Life Orb
Ability: Sheer Force
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Sludge Wave
- Earth Power
- Ice Beam
- Substitute

Bronzong @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 SpD / 8 Def
Sassy Nature
-Psychic
-Gyro Ball
-Toxic
-Protect

Heatran @ Firium Z
Ability: Flash Fire
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
-Magma Storm
-Earth Power
-Taunt
-Toxic

Levea said:

Kartana @ Choice Band
Ability: Beast Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Leaf Blade
- Sacred Sword
- Knock Off
- Smart Strike
Counters it offensively assuming you do not switch it in on it directly.
252 Atk Choice Band Kartana Leaf Blade vs. 0 HP / 0 Def Nidoking: 351-414 (115.8 - 136.6%) -- guaranteed OHKO
Edit: if grassy terrain is up it KOs without the Band.

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You can't assume Grassy Terrain. Also to be a counter and not a check you need to be able to win in every likely scenario even when manually switching into the battle, which your Kartana set does not. Kartana only 2HKOs while +1 Zygarde also 2HKOs. If Kartana is switching in, it takes one Thousand Arrows, gets off one Leaf Blade and then dies to the second. Kartana is a check because to get a guaranteed win in this matchup it has to have a free switch in.

A counter for Zygarde here would be

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

It can survive switching in to any of Zygarde's attacks and win by stalling it out with Toxic and Recover.

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

Burn from scald does very little harm to Venusuar, uneffected by toxic, and giga Drain will KO Quagsire.

Swalot @ Assault Vest
Ability: Liquid Ooze
EVs: 248 HP / 200 SpA / 60 SpD
Quiet Nature
-Sludge Bomb
-Ice Beam
-Earthquake
-Giga Drain

Good luck Venu, good luck.

Tapu Lele @ Fightinium Z
Ability: Psychic Surge
EVs: 252 SpA / 252 Spe / 4 SpD
Timid Nature
-Psyshock
-Moonblast
-Focus Blast
-Hidden Power Fire

200+ SpA Swalot Sludge Bomb vs. 0 HP / 4 SpD Tapu Lele: 186-222 (66.1 - 79%) -- guaranteed 2HKO

RIP Swalot

I'm legit surprised Swalot actually even has a 2HKO lol, anyway.

Magearna @ Assault Vest
Ability: Soul-Heart
EVs: 248 HP / 8 SpA / 252 SpD
Sassy Nature
-Fleur Cannon
-Iron Head
-Volt Switch
-Hidden Power Fire

Lele 4HKOs at best even with using its Z-move while Magearna 2HKOs with Iron Head or Fleur Cannon

Heatran @ Firium Z
Ability: Flash Fire
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Magma Storm
- Earth Power
- Taunt
- Toxic

Petuuuhhh said:

Magikarp @ Waterium Z
Ability: Swift Swim
EVs: 68 HP / 188 SpA / 252 SpD
Mild Nature
- Rain Dance
- Hydro Pump
- Flail
- Bounce

Heatran has to choose whether to use Taunt or let Magikarp get off a Rain Dance. If Taunted, Magikarp uses its Z-move and gets off 61.9 - 73% dmg. Next turn, Heatran strikes an Earth Power for 84.3 - 99.4% dmg, then Karp gets off a 37.1 - 44.5% dmg Hydro Pump to win.

If Karp gets off a Rain Dance, it goes first next turn, firing off a 185 BP Hydro Vortex for 92.8 - 109.5% dmg -- 56.3% chance to OHKO :)

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Wait, this isn't a counter. You have to be able to switch it into the Pokémon that you're countering no matter what they do. Karp switches in and takes an Earth Power and gets KO'd the next turn.

5qwerty said:

Wait, this isn't a counter. You have to be able to switch it into the Pokémon that you're countering no matter what they do. Karp switches in and takes an Earth Power and gets KO'd the next turn.

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

Here's an actual counter for Heatran then.

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

Chansey @ Eviolite
Ability: Natural Cure
EVs: 244 HP / 252 Def / 12 SpD
Bold Nature
- Seismic Toss
- Toxic
- Stealth Rock
- Soft-Boiled

gimmepie said:

Chansey @ Eviolite
Ability: Natural Cure
EVs: 244 HP / 252 Def / 12 SpD
Bold Nature
- Seismic Toss
- Toxic
- Stealth Rock
- Soft-Boiled

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*Scizor
-Item: Scizorite
-Nature: Adamant
-Ability: Technician {Technician}
-EVs: 252 HP / 252 ATK / 4 SpE
-Moveset:
Defog
Bullet Punch
Superpower
U-Turn/Roost

Tapu Lele @ Choice Specs
Ability: Psychic Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Psychic
- Moonblast
- Psyshock
- Hidden Power Fire

*Bronzong
-Item: Wiki Berry
-Nature: Sassy
-Ability: Heatproof
-EVs: 252 HP / 4 DEF / 252 SpD
-IVs: 0 SpE
-Moveset:
Hypnosis
Trick Room
Explosion
Gyro Ball

Stakataka @ Groundium Z
Ability: Beast Boost
EVs: 252 HP / 252 Atk / 4 SpD
IVs: 15 Def / 0 Spe
Lonely Nature
- Trick Room
- Gyro Ball
- Stone Edge
- Earthquake

Landorus-Therian @ Leftovers
Ability: Intimidate
EVs: 252 HP / 240 Def / 16 Spe
Impish Nature
- Stealth Rock
- Earthquake
- Hidden Power Ice
- U-turn

Eelektross @ Assault Vest
Ability: Levitate
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
-Volt Switch
-Giga Drain
-Flamethrower
-Knock Off

Incineroar @ Incinium Z
Ability: Intimidate
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Darkest Lariat
- Earthquake
- Flare Blitz

easily eats 2 volt switch attacks and can 0HKO with it's z move, but if it fails it can pick up a KO on the next turn due to outspeeding