Counter team

Spoiler

[3D='beedrill-mega']

Beedrill @ Beedrillite
Ability: Sniper
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Drill Run
- U-turn
- Poison Jab
- Protect

[3D='mandibuzz']

Mandibuzz (F) @ Leftovers
Ability: Overcoat
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Defog
- Roost
- Toxic
- Foul Play

[3D='rotom-wash']

Rotom-Wash @ Choice Scarf
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Volt Switch
- Thunderbolt
- Trick
- Hydro Pump

[3D='sylveon']

Sylveon @ Leftovers
Ability: Pixilate
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
- Hyper Voice
- Toxic
- Protect
- Wish

[3D='latios']

Latios (M) @ Life Orb
Ability: Levitate
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Draco Meteor
- Psyshock
- Roost
- Hidden Power [Fire]

[3D='bisharp']

Bisharp @ Life Orb
Ability: Defiant
EVs: 252 HP / 212 Atk / 44 Def
Adamant Nature
- Swords Dance
- Knock Off
- Sucker Punch
- Iron Head

All right I shall give this a go!

[3D='skarmory']

Skarmory @ Rocky Helmet
Ability: Sturdy
EVs: 248 HP / 236 Def / 24 Spe
Bold Nature
- Stealth Rock
- Roost
- Spikes
- Whirlwind

As a starter I would have Skarmory go first. I see that your team doesn't have any hazards to throw out so Defog on Skarmory isn't necessary. I would set up the stealth rock for the Beedrill. It's going to have a hard time fighting Skarmory, especially when Stealth Rocks come into play. Though there is a Defog on your team, without Mandibuzz, Skarmory will be terrifying with it's Hazards.

[3D='thundurus']
Thundurus-Therian (M) @ Choice Specs
Ability: Volt Absorb
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Nasty Plot
- Thunderbolt
- Focus Blast
- Hidden Power [Ice]

This guy right here is for that Mandibuzz. Sure, she's powerful, but Thundurus-Therian can almost one shot it with a Thunderbolt.

252 SpA Thundurus-T Thunderbolt vs. 252 HP / 4 SpD Mandibuzz: 332-392 (78.3 - 92.4%) -- guaranteed 2HKO after Leftovers recovery

[3D='venusaur']
Venusaur @ Venusaurite
Ability: Overgrow
EVs: 248 HP / 252 SpA / 8 SpD
Modest Nature
- Giga Drain
- Sludge Bomb
- Sleep Powder
- Synthesis

Now this is one of my favs to use since it's so OP, and it definitely goes well against this team. Sylveon can be two-shot by Sludge Bomb despite it's tankiness to Special Attacks. Giga Drain is a huge offensive against Rotom-Wash and, ultimately, Rotom is unable to trick a Pokémon that holds a Mega Stone.

[3D='sableye']
Sableye @ Leftovers
Ability: Prankster
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Taunt
- Will-O-Wisp
- Knock Off
- Foul Play

Now this guy is completely for utility. Taunt to avoid the Defog from Mandibuzz. Knock off for leftovers, Foul Play would do some oober damage to Beedrill and one-shot it -- and it can tank incoming attacks from a Mega Beedrill.

[3D='garchomp']
Garchomp @ Choice Scarf
Ability: Rough Skin
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Stone Edge
- Outrage
- Dragon Claw

This bad boy here is for both Bisharp and Latios. Though it is slower than Latios, Choice Scarf will give it speed priority over Latios. Since it's technically faster with Choice Scarf, it can one shot Latios with a Dragon attack and Bisharp with Earthquake,

[3D='clefable']
Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
- Aromatherapy
- Moonblast
- Wish
- Cosmic Power

To be honest, I wasn't too sure what to put as the sixth as I felt like four Pokémon on my team could completely counter all six, however I felt a Utility/Special Wall would be a perfect end to this counter team. Aromatherapy and Wish to heal switches, Cosmic Power to boost tankiness, and Moonblast for Latios.


Tell me what you think!

 

So... ​

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Diancie-Mega @ Diancite​

Ability: Magic Bounce​

EVs: 252 SpA / 4 SpD / 252 Spe​

Modest Nature​

- Calm Mind​

- Rock Polish​

- Moonblast​

- Earth Power​

​

The first thing I notice is how weak you are to M-Diancie. Nothing switches in, as most things get 2HKO'd In fact, the only checks are Sylveon and M-Beedrill, the latter of which can be defeated after Rock Polish. While it's pretty hard to set up, Mandibuzz is free set-up, which is perfect because...​

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Scizor @ Choice Band​

Ability: Technician
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- Bullet Punch
- Knock Off
- Superpower
- U-turn

As Mandibuzz is one of your Physically Defensive walls, Scizor baits it in nicely, giving Diancie a free set-up turn. It also beats Sylveon and M-Beedrill, both of M-Diancie's checks. Unfortunately for you, Rotom-W is not a switch-in, as U-turn is a solid 2HKO, and allows Scizor to pivot to something that can kill it, suck as M-Diancie.

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Keldeo @ Leftovers
Ability: Justified
EVs: 252 SpA / 252 Spe
Timid Nature
- Substitute
- Calm Mind
- Secret Sword
- Scald

Since the previous 2 Pokémon have a (somewhat) awful time vs. Bisharp, Keldeo counters it perfectly. A Substitute on a predicted Sucker Punch/Switch means free set-up or damage, which is very important in whittling down Latios. In addition, it can serve as a check to M-Beedrill, 2HKOs Rotom-W at +1, and outright beats Mandibuzz.

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Tyranitar @ Choice Scarf​

Ability: Sand Stream
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Stone Edge
- Pursuit
- Earthquake
- Ice Beam

Since M-Diancie's Modest, Latios poses as a severe threat to the first half of the team. That's where T-tar comes in, Pursuit-trapping the Latios. That's pretty much it.

Talonflame @ Choice Band​

Ability: Gale Wings​

EVs: 252 Atk / 4 SpD / 252 Spe​

Adamant Nature​

- Brave Bird​

- Flare Blitz​

- U-turn​

- Tailwind​

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Important check to M-Beedrill, can easily come in on a U-turn. CB Brave Bird does a lot, esp. with many ways to whittle Rotom-W and Mandibuzz. It outright beats sylveon, and can either 50/50 the Bisharp, or pick it off if it's low. It's a very solid revenge-killer that forms a Volt-turn core with Scizor, which can be problematic for your team. ​

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Latias (F) @ Life Orb​

Ability: Levitate​

EVs: 252 SpA / 4 SpD / 252 Spe​

Timid Nature​

- Defog​

- Healing Wish​

- Psyshock​

- Draco Meteor​

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Healing Wish support. Even though no hazards on your team, Defog is general utility, which can be replaced with HP Fighting. It also outspeeds HP Fire Latios by 1 point, and can hit Sylveon hard with Psyshock. It also destroys Mandi w/ Draco, and counters Rotom-W. It only really has trouble with Bisharp and M-Beedrill(which can't switch in.)​