I call this one 6-0d by mega scizor.
Suicune @ Leftovers
Ability: Pressure
EVs: 252 HP / 40 SpD / 216 Spe
Timid Nature
IVs: 0 Atk
- Scald
- Protect
- Substitute
- Calm Mind
Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 88 Def / 168 SpD
Impish Nature
IVs: 0 Spe
- Spikes
- Leech Seed
- Gyro Ball
- Power Whip
Hippowdon @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 144 Def / 112 SpD
Impish Nature
- Stealth Rock
- Earthquake
- Stone Edge
- Slack Off
Latias-Mega (F) @ Latiasite
Ability: Levitate
EVs: 252 HP / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Recover
- Ice Beam
- Reflect Type
Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 184 Def / 72 SpD
Bold Nature
IVs: 0 Atk
- Calm Mind
- Flamethrower
- Soft-Boiled
- Moonblast
Tornadus-Therian (M) @ Assault Vest
Ability: Regenerator
EVs: 252 HP / 4 SpD / 252 Spe
Hasty Nature
- Heat Wave
- U-turn
- Hurricane
- Knock Off
Ability: Pressure
EVs: 252 HP / 40 SpD / 216 Spe
Timid Nature
IVs: 0 Atk
- Scald
- Protect
- Substitute
- Calm Mind
Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 88 Def / 168 SpD
Impish Nature
IVs: 0 Spe
- Spikes
- Leech Seed
- Gyro Ball
- Power Whip
Hippowdon @ Leftovers
Ability: Sand Stream
EVs: 252 HP / 144 Def / 112 SpD
Impish Nature
- Stealth Rock
- Earthquake
- Stone Edge
- Slack Off
Latias-Mega (F) @ Latiasite
Ability: Levitate
EVs: 252 HP / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Recover
- Ice Beam
- Reflect Type
Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 184 Def / 72 SpD
Bold Nature
IVs: 0 Atk
- Calm Mind
- Flamethrower
- Soft-Boiled
- Moonblast
Tornadus-Therian (M) @ Assault Vest
Ability: Regenerator
EVs: 252 HP / 4 SpD / 252 Spe
Hasty Nature
- Heat Wave
- U-turn
- Hurricane
- Knock Off
Ok so first of all I wanted to use Suicune+Ferro because it's a really fat core and they cover eachothers weaknesses very well. (Ferro gets up spikes vs grass, suicune cms on fires) Next, I noticed that Mega Manectric was a huge threat since it destroys both suicune and ferro, so I decided on using hippowdon to 1 get up rocks, and wall mega mane. Stone Edge is used because ferro+cune doesn't really do much vs birds. The first thing I noticed was the huge huge breloom weakness. I put a mega latias here simply because breloom 6-0d and I wanted a good counter. Rtype is used because twave isn't needed for anything. Looking at my team, my dark resist is mega latias so I decided on using clefable. Clef+Ferro+Hippo beats all relevant darks so i wasn't scared of things like weavile, bisharp, etc.. Gengar and Serp were looking like huge threats so I decided on using tornt as the final mon. TornT also provides a secondary Keldeo counter. I'm using max hp max speed so i can actually switchin to specs hydros/scalds.