Blacephalon's Happiest Day V. 1.0

Blacephalon @ Choice Specs
Ability: Beast Boost
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Fire Blast
- Shadow Ball
- Hidden Power [Ice]
- Trick

Latios-Mega @ Latiosite
Ability: Levitate
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Draco Meteor
- Psychic
- Earthquake
- Recover

Tyranitar (F) @ Assault Vest
Ability: Sand Stream
EVs: 248 HP / 252 Atk / 8 SpA
Brave Nature
- Stone Edge
- Pursuit
- Earthquake
- Ice Beam

Landorus-Therian (M) @ Leftovers
Ability: Intimidate
EVs: 248 HP / 220 Def / 24 SpD / 16 Spe
Impish Nature
- Stealth Rock
- Earthquake
- Hidden Power [Ice]
- U-turn

Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 248 HP / 180 Def / 80 Spe
Bold Nature
IVs: 0 Atk
- Hydro Pump
- Volt Switch
- Pain Split
- Defog

Tangrowth (M) @ Assault Vest
Ability: Regenerator
EVs: 252 HP / 4 Def / 252 SpD
Sassy Nature
- Giga Drain
- Earthquake
- Knock Off
- Hidden Power [Ice]