Decided to go along with the Diancie-Mega + Salamence core and slap in Aegislash as a nice touch Fairy-Dragon-Steel tri-core. However, I felt the tri-core was severely outmatched by Rain and Suicune + Breloom fitted perfectly into the team, so I did what I gotta do. Lastly, I put Talonflame for fire coverage and a wonderful Fire-Water-Grass tri-core as well as means for another Earthquake switch-in and speed control.
Diancie-Mega @ Diancite
Ability: Clear Body
EVs: 208 Atk / 48 SpA / 252 Spe
Hasty Nature
- Diamond Storm
- Moonblast
- Earth Power
- Protect
Salamence @ Life Orb
Ability: Intimidate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Fire Blast
- Hydro Pump
- Protect
Aegislash @ Weakness Policy
Ability: Stance Change
EVs: 216 HP / 204 SpA / 88 Spe
Modest Nature
IVs: 30 Spe
- Shadow Ball
- Flash Cannon
- Wide Guard
- King's Shield
Talonflame @ Life Orb
Ability: Gale Wings
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Brave Bird
- Flare Blitz
- Tailwind
- Protect
Suicune @ Sitrus Berry
Ability: Pressure
EVs: 252 HP / 16 Def / 144 SpA / 40 SpD / 56 Spe
Bold Nature
- Tailwind
- Hydro Pump
- Ice Beam
- Snarl
Breloom @ Focus Sash
Ability: Technician
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Spore
- Mach Punch
- Bullet Seed
- Protect
Ability: Clear Body
EVs: 208 Atk / 48 SpA / 252 Spe
Hasty Nature
- Diamond Storm
- Moonblast
- Earth Power
- Protect
Salamence @ Life Orb
Ability: Intimidate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Fire Blast
- Hydro Pump
- Protect
Aegislash @ Weakness Policy
Ability: Stance Change
EVs: 216 HP / 204 SpA / 88 Spe
Modest Nature
IVs: 30 Spe
- Shadow Ball
- Flash Cannon
- Wide Guard
- King's Shield
Talonflame @ Life Orb
Ability: Gale Wings
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Brave Bird
- Flare Blitz
- Tailwind
- Protect
Suicune @ Sitrus Berry
Ability: Pressure
EVs: 252 HP / 16 Def / 144 SpA / 40 SpD / 56 Spe
Bold Nature
- Tailwind
- Hydro Pump
- Ice Beam
- Snarl
Breloom @ Focus Sash
Ability: Technician
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Spore
- Mach Punch
- Bullet Seed
- Protect