Sun core with Mega- gengar

Charizard @ Charizardite Y
Ability: Blaze
EVs: 252 HP / 4 Def / 44 SpA / 20 SpD / 188 Spe
Modest Nature
- Heat Wave
- Overheat
- SolarBeam
- Protect

Whimsicott @ Focus Sash
Ability: Prankster
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Moonblast
- Beat Up
- Safeguard
- Protect

Terrakion @ Lum Berry
Ability: Justified
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Close Combat
- Rock Slide
- Quick Guard
- Protect

Milotic @ Assault Vest
Ability: Competitive
EVs: 236 HP / 156 Def / 100 SpA / 12 SpD / 4 Spe
Modest Nature
IVs: NaN Atk / 30 SpA / 30 Spe
- Icy Wind
- Scald
- Ice Beam
- Mirror Coat

Gengar @ Gengarite
Ability: Levitate
EVs: 188 HP / 20 Def / 44 SpA / 4 SpD / 252 Spe
Timid Nature
- Shadow Ball
- Sludge Bomb
- Disable
- Protect

Shiftry @ King's Rock
Ability: Chlorophyll
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Fake Out
- Fling
- Leaf Blade
- Protect