Mega Diancie Team

Diancie-Mega @ Diancite
Ability: Magic Bounce
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Moonblast
- Earth Power
- Calm Mind
- Power Gem

Heatran @ Leftovers
Ability: Flash Fire
EVs: 208 HP / 48 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Magma Storm
- Toxic
- Substitute
- Taunt

Ferrothorn @ Chople Berry
Ability: Iron Barbs
EVs: 252 HP / 252 Def
Impish Nature
IVs: 0 Spe
- Stealth Rock
- Gyro Ball
- Toxic
- Leech Seed

Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 252 HP / 208 Def / 48 SpD
Bold Nature
IVs: 0 Atk
- Will-O-Wisp
- Pain Split
- Volt Switch
- Hydro Pump

Landorus-Therian @ Focus Sash
Ability: Intimidate
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
- Stealth Rock
- Earthquake
- Hidden Power [Ice]
- Explosion

Magearna @ Steelium Z
Ability: Soul-Heart
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Shift Gear
- Flash Cannon
- Ice Beam
- Thunderbolt