Diancie offense

Charlotte (Diancie-Mega) @ Diancite
Ability: Clear Body
Shiny: Yes
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Diamond Storm
- Protect
- Earth Power
- Moonblast

Richard (Nidoking) @ Life Orb
Ability: Sheer Force
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Ice Beam
- Flamethrower
- Sludge Wave
- Earth Power

Fawkes (Talonflame) @ Choice Band
Ability: Gale Wings
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Brave Bird
- U-turn
- Flare Blitz
- Roost

Tide (Rotom-Wash) @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 Def / 8 Spe
Bold Nature
IVs: 0 Atk
- Volt Switch
- Hydro Pump
- Pain Split
- Will-O-Wisp

Nagini (Serperior) @ Leftovers
Ability: Contrary
EVs: 56 HP / 200 SpA / 252 Spe
Timid Nature
IVs: 0 Atk / 30 SpA / 30 Spe
- Leaf Storm
- Substitute
- Leech Seed
- Hidden Power [Fire]

Southwest (Latios) @ Life Orb
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Psyshock
- Surf
- Defog