Blacephalon's Happiest Day V. 1.1

Blacephalon @ Ghostium Z
Ability: Beast Boost
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Flamethrower
- Shadow Ball
- Substitute

Shuckle (M) @ Mental Herb
Ability: Sturdy
EVs: 252 HP / 180 Def / 76 SpD
Bold Nature
IVs: 0 Atk
- Sticky Web
- Stealth Rock
- Final Gambit
- Encore

Ditto @ Choice Scarf
Ability: Imposter
EVs: 248 HP / 252 Def / 8 SpD
Relaxed Nature
IVs: 0 Atk / 1 Spe
- Transform

Keldeo-Resolute @ Leftovers
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Scald
- Secret Sword
- Taunt

Gardevoir-Mega (F) @ Gardevoirite
Ability: Trace
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Psyshock
- Hyper Voice
- Focus Blast

Thundurus-Therian @ Assault Vest
Ability: Volt Absorb
EVs: 144 HP / 112 SpA / 252 Spe
Timid Nature
IVs: 30 Atk
- Volt Switch
- Hidden Power [Ice]
- Knock Off
- Grass Knot