this team is meh help me fix

Gengar @ Ghostium Z
Ability: Cursed Body
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Shadow Ball
- Sludge Wave
- Focus Blast
- Taunt

Greninja @ Life Orb
Ability: Protean
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
IVs: 0 Atk
- Spikes
- Hydro Pump
- Ice Beam
- Hidden Power [Fire]

Zygarde @ Leftovers
Ability: Aura Break
EVs: 240 HP / 212 SpD / 56 Spe
Careful Nature
- Substitute
- Thousand Arrows
- Toxic
- Extreme Speed

Scizor-Mega @ Scizorite
Ability: Technician
EVs: 252 HP / 12 Atk / 116 Def / 128 SpD
Impish Nature
- U-turn
- Bullet Punch
- Defog
- Roost

Tapu Koko @ Zap Plate
Ability: Electric Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 30 Atk
- Thunderbolt
- Hidden Power [Ice]
- U-turn
- Volt Switch

Dugtrio @ Focus Sash
Ability: Arena Trap
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Stealth Rock
- Earthquake
- Stone Edge
- Reversal