Counter that Pokémon

Ferrothorn (F) @ Leftovers
Trait: Iron Barbs
EVs: 252 HP / 4 Atk / 252 Def
Relaxed Nature (+Def, -Spd)
- Protect
- Leech Seed
- Stealth Rock
- Gyro Ball

252 Atk Choice Band Teravolt Kyurem-B Outrage vs. 252 HP / 252+ Def Ferrothorn: 107-126 (30.3 - 35.7%) -- guaranteed 4HKO after Leftovers recovery
0 SpA Teravolt Kyurem-B Ice Beam vs. 252 HP / 0 SpD Ferrothorn: 100-118 (28.4 - 33.5%) -- 93.2% chance to 4HKO after Leftovers recovery

4 Atk Ferrothorn Gyro Ball (116 BP) vs. 0 HP / 0 Def Kyurem-B: 236-282 (60.3 - 72.1%) -- guaranteed 2HKO

Torkoal @White Herb
Ability: Shell Armor
EVs: 4 HP / 252 SpA / 252 Spe
Nature: Timid
- Shell Smash
- Fire Blast
- Earth Power
- Hidden Power Grass

4 Atk Ferrothorn Gyro Ball (55 BP) vs. 0 HP / 4 Def Torkoal: 21-25 (7.4 - 8.8%) -- possibly the worst move ever
4 Atk Ferrothorn Gyro Ball (111 BP) vs. 0 HP / 4 Def Torkoal: 42-51 (14.9 - 18.1%) -- possible 6HKO

252 SpA Torkoal Fire Blast vs. 252 HP / 0 SpD Ferrothorn: 472-564 (134 - 160.2%) -- guaranteed OHKO

Latios (M) @ Choice Specs
Trait: Levitate
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Draco Meteor
- Surf
- Psyshock
- Trick

Latios takes less than 25% from all of Torkoal's moves with no stat boosts. It can survive a +2 Fire Blast and OHKO Torkoal with either Surf or Draco Meteor.

+2 252 SpA Torkoal Fire Blast vs. 4 HP / 0 SpD Latios: 124-147 (41 - 48.6%) -- guaranteed 3HKO

-Jirachi w/Leftovers
Nature: Careful
Ability: Serene Grace
EVs: 252 HP, 252 Sp.Defense, 4 Speed
Moves: Iron Head, Thunder Wave, Wish, Protect

252 SpA Choice Specs Latios Draco Meteor vs. 252 HP / 252+ SpD Jirachi: 114-135 (28.2 - 33.4%) -- 94.6% chance to 4HKO after Leftovers recovery

252 SpA Choice Specs Latios Surf vs. 252 HP / 252+ SpD Jirachi: 107-126 (26.4 - 31.1%) -- 11.5% chance to 4HKO after Leftovers recovery

Specs Latios can only 4HKO 'Rachi at best. Trick doesn't matter much, since it doesn't have priority, so Jirachi can Thunder Wave, then spam Iron Head (which will go first since Latios's Speed is cut by paralysis), which is ok to get locked into since:

0 Atk Jirachi Iron Head vs. 4 HP / 0 Def Latios: 103-123 (34.1 - 40.7%) -- guaranteed 3HKO

So it can kill Latios before Latios kills it (not to mention paraflinch).

Garchomp @Yache Berry
Nature: Jolly
Ability: Rough Skin
EVs: 252 Atk, 252 Spd, 4 Hp

Earthquake, Sword Dance, Outrage, Substitute

Iron Head: 0 Atk Jirachi Iron Head vs. 4 HP / 0 Def Garchomp: 91-108 (25.4 - 30.1%) -- guaranteed 4HKO

Earthquake: 252 Atk Garchomp Earthquake vs. 252 HP / 0 Def Jirachi: 326-386 (80.6 - 95.5%) -- guaranteed 2HKO after Leftovers recovery

It is immune to TW and can either SD or Sub on the switch.

Regice
Nature: Jolly
Ability: Clear body
EVs: 252 Spa, Def Spd, 4 Hp
-Explosion
-Ice beam
-Blizzard
-Hyper beam

With massive Special defense,Regice can take almost any special hit.It has also good physical defense of 100.
So,Regice takes a hit because he's slow and then Ice beam/Blizzard and Garchomp is destroyed.

ExtremeStyle said:

Regice
Nature: Jolly
Ability: Clear body
EVs: 252 Spa, Def Spd, 4 Hp
-Explosion
-Ice beam
-Blizzard
-Hyper beam

With massive Special defense,Regice can take almost any special hit.It has also good physical defense of 100.
So,Regice takes a hit because he's slow and then Ice beam/Blizzard and Garchomp is destroyed.

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Regice is a terrible counter for Garchomp because it still takes massive damage from its Swords Dance-boosted moves, and may Arceus have mercy on you if Garchomp had a Substitute up before you switched in. If it did have a Substitute, Garchomp can set up a Swords Dance as Regice breaks it. Earthquake or Outrage backed by +2 Attack can then OHKO Regice.

Your set has a lot of flaws. 1. Jolly is terrible because it wastes away its good Special Attack. 2. It's pointless to invest in Speed on a Pokemon that's very slow unless it's meant to outspeed certain walls. 3. Hyper Beam is a terrible move because of its recharge turn making Regice a sitting duck. 4. Explosion is weak running off of base 50 Attack. 5. Thunderbolt and Focus Blast are coverage moves you could've used.

Anyway:

Klinklang:

-Shift Gear
-Gear Grind
-Wild Charge
-Return
Nature: Adamant
EVs: 100 HP/252 Atk/156 Spe
Item: Leftovers
Ability: Clear Body

Klinklang resists all of Regice's moves, giving it time to set up a Shift Gear, followed by hitting it hard with Gear Grind.

-Rotom H w/Leftovers
Nature: Bold
Ability: Levitate
EVs: 252 HP, 252 Defense, 4 Sp.Attack
Moves: Overheat, Thunderbolt, Will-o-Wisp, Thunder Wave

+1 252+ Atk Klinklang Return vs. 252 HP / 252+ Def Rotom-H: 105-124 (34.5 - 40.7%) -- 54.6% chance to 3HKO after Leftovers recovery

Then Rotom-H toasts Klinklang with Overheat.

Swampert (M) @ Lum Berry
Trait: Torrent
EVs: 252 HP / 252 Atk / 4 Spd
Adamant Nature (+Atk, -SAtk)
- Counter
- Mirror Coat
- Earthquake
- Waterfall

Walls Rotom-H, and is able to knock it out with just one Waterfall.

Nymphadora said:

Swampert (M) @ Lum Berry
Trait: Torrent
EVs: 252 HP / 252 Atk / 4 Spd
Adamant Nature (+Atk, -SAtk)
- Counter
- Mirror Coat
- Earthquake
- Waterfall

Walls Rotom-H, and is able to knock it out with just one Waterfall.

Click to expand...

Rotom-Mow @ Leftovers
Ability: Levitate
EVs: 252 SAtk / 252 HP / 4 SDef
Modest Nature
- Leaf Storm
- Volt Switch
- Will-O-Wisp
- Thunderbolt

Obviously Rotom-C. Takes nothing from Swampert's STABs, and can easily OHKO with Leaf Storm

Virizion @ Life Orb
Trait: Justified
EVs: 252 Atk / 252 Spd / 4 Def
Adamant Nature (+Atk, -SAtk)
- Leaf Blade
- Close Combat
- Stone Edge
- Swords Dance

Could defeat Rotom with either two Stone Edges or Close Combats. If it manages to set up Swords Dance somehow, then it should be able to OHKO Rotom with any of its moves.

Amoonguss (F) @ Black Sludge
Trait: Regenerator
EVs: 252 HP / 228 Def / 28 SAtk
Bold Nature (+Def, -Atk)
- Spore
- Giga Drain
- Clear Smog
- Sludge Bomb

Amoongus is bulky enough to endure Virizion's moves.

252+ Atk Life Orb Virizion Stone Edge vs. 252 HP / 228+ Def Amoonguss: 112-133 (25.9 - 30.7%) -- 1.8% chance to 4HKO after Black Sludge recovery

If Virizion uses Stone Edge when Amoongus is brought out, it'll be able to 3HKO Virizion with ease after it uses Spore on the following turn.

28 SpA Amoonguss Sludge Bomb vs. 0 HP / 0 SpD Virizion: 140-168 (43.3 - 52%) -- 9.4% chance to 2HKO

If Virizion sets up Swords Dance, the combo of the aforementioned moves can be used once again to defeat it.

+2 252+ Atk Life Orb Virizion Stone Edge vs. 252 HP / 228+ Def Amoonguss: 222-263 (51.3 - 60.8%) -- 91.8% chance to 2HKO after Black Sludge recovery

Volcarona @Chesto Berry
Nature: Modest
Ability: Flame Body
EVs: 160 Hp, 236, SpAtk, 112 Sped

Fiery Dance, Quiver Dance, Rest, Bug Buzz

28 SpA Amoonguss Sludge Bomb vs. 160 HP / 0 SpD Volcarona: 84-100 (23.9 - 28.4%) -- possible 5HKO

236+ SpA Volcarona Fiery Dance vs. 252 HP / 0 SpD Amoonguss: 354-416 (81.9 - 96.2%) -- guaranteed 2HKO after Black Sludge recovery

The only way that mushroom has a chance is if he uses Spore on the switch-->gets rid of Chesto Berry-->survives first hit --> uses Spore again. With Sleep Clause active it's GG.

-Tyranitar w/Assault Vest
Nature: Sassy
Ability: Sand Stream
EVs: 252 HP, 252 Sp.Defense, 4 Attack
Moves: Stone Edge, Crunch, Earthquake, Fire Blast

+1 236+ SpA Volcarona Bug Buzz vs. 252 HP / 252+ SpD Assault Vest Tyranitar in Sand: 158-188 (39.1 - 46.5%) -- guaranteed 3HKO

Avoids the 2HKO thanks to maximum investment in special bulk, Assault Vest, and the sand, then easily OHKOs Volcarona with Stone Edge.

Quagsire (M) @ Leftovers
Trait: Unaware
EVs: 252 HP / 4 Atk / 252 Def
Relaxed Nature (+Def, -Spd)
- Recover
- Scald
- Earthquake
- Toxic

4 Atk Tyranitar Crunch vs. 252 HP / 252+ Def Quagsire: 90-106 (22.8 - 26.9%) -- possible 5HKO after Leftovers recovery
4 Atk Quagsire Earthquake vs. 252 HP / 0 Def Tyranitar: 174-206 (43 - 50.9%) -- 4.7% chance to 2HKO

Trevenant:

-Horn Leech
-Earthquake
-Will-o-Wisp
-Rest
Nature: Impish
EVs: 252 HP/180 Def/76 Spe
Item: Lum Berry
Ability: Harvest

Trevenant takes a pittance from both of Quagsire's offensive moves and KOs back with Horn Leech. While Trevenant won't like taking burn or poison, it can Rest it off.

PlatinumDude said:

Regice is a terrible counter for Garchomp because it still takes massive damage from its Swords Dance-boosted moves, and may Arceus have mercy on you if Garchomp had a Substitute up before you switched in. If it did have a Substitute, Garchomp can set up a Swords Dance as Regice breaks it. Earthquake or Outrage backed by +2 Attack can then OHKO Regice.

Your set has a lot of flaws. 1. Jolly is terrible because it wastes away its good Special Attack. 2. It's pointless to invest in Speed on a Pokemon that's very slow unless it's meant to outspeed certain walls. 3. Hyper Beam is a terrible move because of its recharge turn making Regice a sitting duck. 4. Explosion is weak running off of base 50 Attack. 5. Thunderbolt and Focus Blast are coverage moves you could've used.

Click to expand...

Its even funnier cos the chomp set has Yache Berry. XD


Anyways

Moltres@Choice Specs
252 SAtk / 252 speed / 6 Sp.Def
Modest Nature
- Fire Blast
- Hurricane
- Hidden Power [Fighting]
- U-Turn

Switches into everything with virtual immunity and decimates Trevenant back.

Lunatone @ Assault Vest
252 HP/ 120 Sp. Atk/ 136 Sp. Def
Nature: Calm
-Psychic
-Hidden Power Rock
-Stealth Rock
-Calm Mind

252+ SpA Choice Specs Moltres Fire Blast vs. 252 HP / 136+ SpD Assault Vest Lunatone: 85-101 (24.7 - 29.3%) -- 100% chance to 4HKO

252+ SpA Choice Specs Moltres Hidden Power Fighting vs. 252 HP / 136+ SpD Assault Vest Lunatone: 63-75 (18.3 - 21.8%) -- possible 5HKO

252+ SpA Choice Specs Moltres Hurricane vs. 252 HP / 136+ SpD Assault Vest Lunatone: 85-101 (24.7 - 29.3%) -- 100% chance to 4HKO

0- Atk Moltres U-turn vs. 252 HP / 0 Def Lunatone: 130-154 (37.7 - 44.7%) -- guaranteed 3HKO

120 SpA Lunatone Hidden Power Rock vs. 0 HP / 6 [4?] SpD Moltres: 324-384 (100.9 - 119.6%) -- guaranteed OHKO

Regardless, if 6 Sp. Def was a typo as opposed to 4, it still didn't matter. Lunatone ftw. Biggest worry for Lunatone is U-Turn, though, and I'm not sure how exactly it'll work, so maybe this set is inherently flawed. Oh well.

Captios said:

Lunatone @ Assault Vest
252 HP/ 120 Sp. Atk/ 136 Sp. Def
Nature: Calm
-Psychic
-Hidden Power Rock
-Stealth Rock
-Calm Mind

252+ SpA Choice Specs Moltres Fire Blast vs. 252 HP / 136+ SpD Assault Vest Lunatone: 85-101 (24.7 - 29.3%) -- 100% chance to 4HKO

252+ SpA Choice Specs Moltres Hidden Power Fighting vs. 252 HP / 136+ SpD Assault Vest Lunatone: 63-75 (18.3 - 21.8%) -- possible 5HKO

252+ SpA Choice Specs Moltres Hurricane vs. 252 HP / 136+ SpD Assault Vest Lunatone: 85-101 (24.7 - 29.3%) -- 100% chance to 4HKO

0- Atk Moltres U-turn vs. 252 HP / 0 Def Lunatone: 130-154 (37.7 - 44.7%) -- guaranteed 3HKO

120 SpA Lunatone Hidden Power Rock vs. 0 HP / 6 [4?] SpD Moltres: 324-384 (100.9 - 119.6%) -- guaranteed OHKO

Regardless, if 6 Sp. Def was a typo as opposed to 4, it still didn't matter. Lunatone ftw. Biggest worry for Lunatone is U-Turn, though, and I'm not sure how exactly it'll work, so maybe this set is inherently flawed. Oh well.

Click to expand...

Assault Vest prevents Lunatone from using status moves like Calm Mind and Stealth Rock. -_-

Anyway:
Bisharp:

-Swords Dance
-Sucker Punch
-Iron Head
-Knock Off
Nature: Adamant
EVs: 124 HP/252 Atk/132 Spe
Item: Dread Plate
Ability: Defiant

Bisharp is immune to Psychic and tanks an HP Rock before slamming Lunatone with a super effective STAB.

-Poliwrath w/Leftovers
Nature: Adamant
Ability: Water Absorb
EVs: 252 Attack, 252 Speed, 4 HP
Moves: Waterfall, Brick Break, Ice Punch, Earthquake

Counters Bisharp since it can come in on any of its moves without being OHKOed, even at +2, then outspeeds and smashes it with Brick Break.