Counter that Pokémon

[Nah]

-Steelix w/Leftovers
Nature: Adamant
Ability: Sturdy
EVs: 252 HP, 252 Attack, 4 Defense
Moves: Iron Tail, Curse, Earthquake, Stone Edge

Not the best Steelix set, but whatever. Dazzling Gleam and Air Alash do little to Steelix, even though its Sp.Defense isn't all that great, allowing it to set up a Curse. Then smashes Togekiss with one good Iron Tail.

 

[Hiatus]

Hydreigon (M) @ Choice Specs
Trait: Levitate
EVs: 252 SAtk / 4 SDef / 252 Spd
Modest Nature (+SAtk, -Atk)
- Draco Meteor
- Dark Pulse
- Surf
- Flamethrower

Flamethrower does the trick; knocks Steelix out with only one hit.

252 SpA Choice Specs Hydreigon Flamethrower vs. 252 HP / 0 SpD Steelix: 408-480 (115.2 - 135.5%) -- guaranteed OHKO

252+ Atk Steelix Iron Tail vs. 0 HP / 0 Def Hydreigon: 147-174 (45.2 - 53.5%) -- 35.5% chance to 2HKO
252+ Atk Steelix Stone Edge vs. 0 HP / 0 Def Hydreigon: 98-116 (30.1 - 35.6%) -- 34.2% chance to 3HKO

 

[Jin Of The Gale]

Azumarill (M) @ Sitrus Berry
Trait: Huge Power
EVs: 252 HP / 252 Atk / 4 SDef
Adamant Nature (+Atk, -SAtk)
- Aqua Jet
- Waterfall
- Play Rough
- Superpower

Immune to Draco Meteor, and resists the other moves.

252+ SpA Choice Specs Hydreigon Dark Pulse vs. 252 HP / 4 SpD Azumarill: 125-147 (30.9 - 36.3%) -- 63.9% chance to 3HKO
252+ Atk Huge Power Azumarill Play Rough vs. 0 HP / 0 Def Hydreigon: 780-924 (240 - 284.3%) -- guaranteed OHKO

 

[Gigabeat]

Victreebel@Leftovers
Chlorophyll
252 SpA/252 HP/4 SPEED
- Sunny Day
- Solarbeam
- Weather Ball
- Sludge Bomb

What can I say? Set up a single Sunny Day, suddenly have broken speed and shrug off Azumarill's attacks. All of them. Solarbeam is now a one turn moves that should BE OHKOing Azumarill pretty easily.

 

[Hiatus]

Houndoom (M) @ Life Orb
Trait: Flash Fire
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Nasty Plot
- Flamethrower
- Dark Pulse
- Hidden Power [Fighting]

Endures a hit or two from Victreebel, then sends it off with Flamethrower.

252 SpA Life Orb Houndoom Flamethrower vs. 252 HP / 0 SpD Victreebel: 460-541 (126.3 - 148.6%) -- guaranteed OHKO

252+ SpA Victreebel Sludge Bomb vs. 4 HP / 0 SpD Houndoom: 162-192 (55.4 - 65.7%) -- guaranteed 2HKO
252+ SpA Victreebel Solar Beam vs. 4 HP / 0 SpD Houndoom: 108-127 (36.9 - 43.4%) -- guaranteed 3HKO
252+ SpA Victreebel Weather Ball (50 BP Normal) vs. 4 HP / 0 SpD Houndoom: 61-72 (20.8 - 24.6%) -- guaranteed 5HKO

 

[Gigabeat]

Keldeo @ Choice Specs
Justified
4 HP/ 252 Speed / 252 SpAtk
- Secert Sword
- Hydro Pump
- Taunt
- Protect

Resists both flamethrower and dark pulse, and gets neutral damage from HP Fighting. Hydro Pump 0HK0s easily, and taunt is to prevent Nasty Plot set ups in case of Hax or Speed Ties.

 

[Jin Of The Gale]

Keldeo @ Choice Specs
Justified
252 HP/ 252 Speed / 252 SpAtk
- Secert Sword
- Hydro Pump
- Taunt
- Protect

You're limited to 510 EVs in total, so you can't have 252 in more than two stats.

Jellicent (F) @ Leftovers
Trait: Water Absorb
EVs: 252 HP / 4 SAtk / 252 SDef
Calm Nature (+SDef, -Atk)
- Recover
- Scald
- Will-O-Wisp
- Hex

Keldeo can't touch Jellicent. Scald is used until Keldeo gets burnt and then Hex, which does 34.9 - 41.1% should be able to KO Keldeo in a hit or two.

 

[Gigabeat]

You're limited to 510 EVs in total, so you can't have 252 in more than two stats.

Jellicent (F) @ Leftovers
Trait: Water Absorb
EVs: 252 HP / 4 SAtk / 252 SDef
Calm Nature (+SDef, -Atk)
- Recover
- Scald
- Will-O-Wisp
- Hex

Keldeo can't touch Jellicent. Scald is used until Keldeo gets burnt and then Hex, which does 34.9 - 41.1% should be able to KO Keldeo in a hit or two.

Yeah, sorry about that. Must have made a slight error when messing around with the EVs, but thanks for pointing it out.
Anyway...

Shaymin@Lum Berry
252 SpA / 252 Speed / 4 SpD
- Seed Flare
- Facade
- Sunny Day
- Synthesis

This one can switch in Jellicent very safely. I don't see Scald doing much to it even without SpD EVs being invested due to the typing. Get a burn and recover it with Lum Berry so that it can aim for a sweep the next turn. If they somehow survive and go for the burn again, Facade and it should knock Jellicent out. Seed Flare is Shaymin's STAB, which technically should have no problem 0HKOing it. Sunny Day increases the effectiveness of Synthesis and renders Scald next to worthless. Basically the aim is to take the burn with the Berry and do a clean sweep before they can try anything. Natural Cure can be a last resort.

 

[PlatinumDude]

Yeah, sorry about that. Must have made a slight error when messing around with the EVs, but thanks for pointing it out.
Anyway...

Shaymin@Lum Berry
252 SpA / 252 Speed / 4 SpD
- Seed Flare
- Facade
- Sunny Day
- Synthesis

This one can switch in Jellicent very safely. I don't see Scald doing much to it even without SpD EVs being invested due to the typing. Get a burn and recover it with Lum Berry so that it can aim for a sweep the next turn. If they somehow survive and go for the burn again, Facade and it should knock Jellicent out. Seed Flare is Shaymin's STAB, which technically should have no problem 0HKOing it. Sunny Day increases the effectiveness of Synthesis and renders Scald next to worthless. Basically the aim is to take the burn with the Berry and do a clean sweep before they can try anything. Natural Cure can be a last resort.

Facade is best used with Pokemon that can abuse status, like Ursaring, Zangoose and Conkeldurr. Shaymin can easily shrug off status with Natural Cure, so Facade is completely pointless. Generally, the point with having Natural Cure as an ability is if the Pokemon is statused, the best course of action is to switch out.

Anyway:

Mega Scizor:

-Swords Dance
-Bullet Punch
-Bug Bite
-Roost
Nature: Adamant
EVs: 248 HP/152 Atk/108 SDef
Item: Scizorite
Ability: Technician

Scizor walls Shaymin entirely and destroys it with Bug Bite or can set up in its face.

 

[Nolafus]

Torkoal @ Leftovers
Ability: White Smoke
EVs: 252 SAtk / 252 HP / 4 SDef
Modest Nature
- Fire Blast
- Earth Power
- Will-O-Wisp
- Clear Smog

As good as Mega-Scizor is, I don't think it's going to do much to Torkoal here. High defenses, resists all of your attacks, and can strike back with a super-effective attack means GG.

 

[Gigabeat]

Thanks to PlatinumDude for pointing that out. I think what I was aiming for was to avoid a burn and go for the straight kill to avoid losing momentum and giving the opponent a set up chance on you while you switch, but I guess either one could work. :)

Milotic @ Leftovers
Marvel Scale
252 HP / 252 DEF / 8 SPD
- Aqua Ring
- Hydro Pump
- Safeguard
- Hypnosis

This one dosen't focus on killing Torkoal. What it does is that while it resists fire blast, it takes neutral damage from Earth Power. Milotic naturally outpseeds Torkoal without Speed EV investment, so it goes out, sets up a Safeguard to prevent status, and aqua ring and / or hypnosis to survive and facilitate a 0HKO targeting Torkoal's low S.Def.

Or to avoid Hax with Earth Power it can just go for the Hypnosis and spam away the HPs. Also if it somehow gets status, Marvel Scale doubles it's defense, making it next to invincible.

 

[PlatinumDude]

Thanks to PlatinumDude for pointing that out. I think what I was aiming for was to avoid a burn and go for the straight kill to avoid losing momentum and giving the opponent a set up chance on you while you switch, but I guess either one could work. :)

Milotic @ Leftovers
Marvel Scale
252 HP / 252 DEF / 8 SPD
- Aqua Ring
- Hydro Pump
- Safeguard
- Hypnosis

This one dosen't focus on killing Torkoal. What it does is that while it resists fire blast, it takes neutral damage from Earth Power. Milotic naturally outpseeds Torkoal without Speed EV investment, so it goes out, sets up a Safeguard to prevent status, and aqua ring and / or hypnosis to survive and facilitate a 0HKO targeting Torkoal's low S.Def.

Or to avoid Hax with Earth Power it can just go for the Hypnosis and spam away the HPs. Also if it somehow gets status, Marvel Scale doubles it's defense, making it next to invincible.

Marvel Scale increases Defense by 1.5x; it doesn't double Defense. Never use low-PP moves as a sole offensive move on defensive Pokemon, as it's a detriment in the long run by making the Pokemon Taunt bait should the offensive move's PP run out. Milotic learns Recover, and defensive Pokemon that have access to recovery moves besides Rest must always use them, and your current Milotic set is worn down easily without Recover, despite Aqua Ring's passive recovery; speaking of Aqua Ring, it only sees use on Vaporeon in Baton Pass teams.

Anyway:

Jynx:

-Substitute
-Nasty Plot
-Ice Beam
-Psyshock
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Lum Berry
Ability: Dry Skin

Jynx switches in on Hydro Pump with impunity; if Milotic tries to sleep it with Hypnosis, Lum Berry can cure the sleep. Jynx then proceeds to use Milotic as setup bait for Nasty Plot and hits it hard with Psyshock.

 

[Pikelodeon]

Hooundoom @ Houndoominite [Unnerve]
-Substitute
-Fire Blast
-Dark Pulse
-Nasty Plot
Nature: Timid
EVs: 252 Speed-252 Spa-4 HP

Mega evolve and substitute. If the substitute isn't broken, nasty plot. Then take out the jynx with either Fire Blast or Dark Pulse. Hyper offensive tactic, but it should work.

 

[Nah]

-Terrakion w/Choice Scarf
Nature: Jolly
Ability: Justified
EVs: 252 attack, 252 Speed, 4 Sp.Defense
Moves: Close Combat, Stone Edge, Earthquake, X-Scissor

Can take a +2 Fire Blast: +2 252 SpA Mega Houndoom Fire Blast vs. 0 HP / 4 SpD Terrakion: 206-243 (63.7 - 75.2%) -- guaranteed 2HKO

Then outspeeds thanks to Choice Scarf and obliterates Mega Houndoom.

 

[Hiatus]

Venusaur @ Venusaurite
Ability: Chlorophyll (Thick Fat)
IVs: 252 HP / 252 SpAtk / 4 SpDef
Nature: Modest
- Synthesis
- Giga Drain
- Sludge Bomb
- Sleep Powder

Has enough bulk to endure some hits, and knocks it out with just one Giga Drain. :P

252+ SpA Mega Venusaur Giga Drain vs. 0 HP / 4 SpD Terrakion: 282-332 (87.3 - 102.7%) -- 18.8% chance to OHKO

252 Atk Terrakion Stone Edge vs. 252 HP / 0 Def Mega Venusaur: 136-162 (37.3 - 44.5%) -- guaranteed 3HKO
252 Atk Terrakion Earthquake vs. 252 HP / 0 Def Mega Venusaur: 91-108 (25 - 29.6%) -- guaranteed 4HKO
252 Atk Terrakion Close Combat vs. 252 HP / 0 Def Mega Venusaur: 81-96 (22.2 - 26.3%) -- 16.5% chance to 4HKO
252 Atk Terrakion X-Scissor vs. 252 HP / 0 Def Mega Venusaur: 73-87 (20 - 23.9%) -- guaranteed 5HKO

 

[Gigabeat]

Tornadus-T @ Lum Berry
Regenerator

-Rain Dance
-Hurricane
-U-Turn
-Heat Wave

Once the rain gets up，it's all over. Chlorophyll becomes useless and it's STAB attacks all become woefully weak. Hurricane and heat wave can proceed to sweep even the bulkiest of Vensaurs.

 

[Nah]

Tornadus-T @ Lum Berry
Regenerator

-Rain Dance
-Hurricane
-U-Turn
-Heat Wave

Once the rain gets up，it's all over. Chlorophyll becomes useless and it's STAB attacks all become woefully weak. Hurricane and heat wave can proceed to sweep even the bulkiest of Vensaurs.

There's 2 things I wanna point out:
1) You need to provide the Pokemon's nature and EVs when posting a set. Natures and EVs are important aspects of battles, especially on this thread where a different EV spread and nature can make or break a counter.
2) Tornadus-T isn't a counter to Mega-Saur. Sludge Bomb 2HKOs, and Hurricane fails to OHKO:

252+ SpA Mega Venusaur Sludge Bomb vs. 0 HP / 0 SpD Tornadus-T: 169-199 (56.5 - 66.5%) -- guaranteed 2HKO
252 SpA Tornadus-T Hurricane vs. 252 HP / 4 SpD Mega Venusaur: 272-324 (74.7 - 89%) -- guaranteed 2HKO

So Tornadus-T takes a SB on the switch-in, fails to kill Mega-Saur on the next turn, and gets killed by a second SB.

And now to counter Tornadus-T:

-Aurorus w/Leftovers
Nature: Modest
Ability: Refrigerate
EVs: 252 HP, 252 Sp.Attack, 4 Sp.Defense
Moves: Ancient Power, Freeze Dry, Tri Attack, Thunderbolt

Aurorus is like "Heat Wave and Hurricane? lol wut":

252 SpA Tornadus-T Hurricane vs. 252 HP / 4 SpD Aurorus: 85-101 (18.8 - 22.4%) -- possible 6HKO after Leftovers recovery
252 SpA Tornadus-T Heat Wave vs. 252 HP / 4 SpD Aurorus: 99-117 (22 - 26%) -- possible 5HKO after Leftovers recovery

Then kills Tornadus-T with a refrigerator. I mean a Refrigerated Tri Attack (which makes it Ice type and gives it a 30% boost on top of STAB):
252+ SpA Refrigerate Aurorus Tri Attack vs. 0 HP / 0 SpD Tornadus-T: 338-398 (113 - 133.1%) -- guaranteed OHKO

And you people say Aurorus sucks.

...ok, its not that good. But it gets brownie points for being adorable.

 

[PlatinumDude]

Conkeldurr:

-Drain Punch
-Mach Punch
-Knock Off
-Ice Punch
Nature: Adamant
EVs: 252 Atk/8 Def/248 SDef
Item: Assault Vest
Ability: Guts

Tanks a hit from Aurorus and beats it down with one of its STABs.

 

[Hiatus]

Talonflame @ Choice Band
Ability: Gale Wings
Nature: Adamant
EVs: 252 Atk / 4 Def / 252 Spe

• Brave Bird
• Flare Blitz
• U-turn
• Will-O-Wisp

252 Atk Choice Band Talonflame Brave Bird vs. 0 HP / 4 Def Conkeldurr: 444-524 (126.4 - 149.2%) -- guaranteed OHKO

252+ Atk Conkeldurr Ice Punch vs. 0 HP / 4 Def Talonflame: 126-149 (42.2 - 50%) -- 0.4% chance to 2HKO
252+ Atk Conkeldurr Knock Off (97.5 BP) vs. 0 HP / 4 Def Talonflame: 163-192 (54.6 - 64.4%) -- guaranteed 2HKO

 

[Chocolate™]

Talonflame @ Choice Band
Ability: Gale Wings
Nature: Adamant
EVs: 252 Atk / 4 Def / 252 Spe

• Brave Bird
• Flare Blitz
• U-turn
• Will-O-Wisp

252 Atk Choice Band Talonflame Brave Bird vs. 0 HP / 4 Def Conkeldurr: 444-524 (126.4 - 149.2%) -- guaranteed OHKO

252+ Atk Conkeldurr Ice Punch vs. 0 HP / 4 Def Talonflame: 126-149 (42.2 - 50%) -- 0.4% chance to 2HKO
252+ Atk Conkeldurr Knock Off (97.5 BP) vs. 0 HP / 4 Def Talonflame: 163-192 (54.6 - 64.4%) -- guaranteed 2HKO

One thing, I know this set is made for the Conkeldurr but I don't really think that Will O Wisp is a good option on Talonflame. It also doesn't make sense having it on a CBed Talonflame.

@ Leftovers
Ability: Sturdy.
Nature: Bold.
EVs: 252 HP/252 Def/ 4 Sp Atck.
Moves:
Power Gem.
Toxic.
Flash Cannon.
Volt Switch.

252+ Atk Choice Band Talonflame Flare Blitz vs. 252 HP / 252+ Def Probopass: 130-154 (40.1 - 47.5%) -- guaranteed 3HKO after Leftovers recovery

4 SpA Probopass Power Gem vs. 0 HP / 0 SpD Talonflame: 372-444 (125.2 - 149.4%) -- guaranteed OHKO

Probopass tanks Flare Blitz and OHKoes with Power Gem.