BHM cause y not

Nihilego @ Choice Scarf
Ability: Levitate
EVs: 252 HP / 4 Def / 252 Spe
Timid Nature
IVs: 0 Atk
- Toxic Spikes
- Roost
- Block
- Perish Song

Xurkitree @ Choice Specs
Ability: Levitate
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Energy Ball
- 10,000,000 Volt Thunderbolt
- Moongeist Beam
- Overheat

Glalie-Mega @ Choice Band
Ability: Moody
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Return
- Destiny Bond
- Rapid Spin
- Earthquake

Gengar-Mega @ Spooky Plate
Ability: Bad Dreams
Shiny: Yes
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Spore
- Quiver Dance
- Secret Sword
- Judgment

Shedinja @ Lum Berry
Ability: Sturdy
EVs: 252 Atk / 4 Def / 252 Spe
Naughty Nature
- Recycle
- Nasty Plot
- Agility
- Acupressure

Tapu Fini @ Choice Specs
Ability: Misty Surge
EVs: 248 HP / 252 SpA / 8 SpD
Modest Nature
IVs: 0 Atk
- Calm Mind
- Hydro Pump
- Dazzling Gleam
- Giga Drain