Bulky Offensive with z koko

Latias-Mega @ Latiasite
Ability: Levitate
EVs: 100 HP / 136 Def / 96 SpA / 176 Spe
Bold Nature
IVs: 0 Atk
- Recover
- Psyshock
- Calm Mind
- Ice Beam

Magearna @ Assault Vest
Ability: Soul-Heart
EVs: 136 HP / 156 Def / 96 SpA / 24 SpD / 96 Spe
Modest Nature
IVs: 0 Atk
- Volt Switch
- Fleur Cannon
- Flash Cannon
- Hidden Power [Fire]

Tapu Koko @ Electrium Z
Ability: Electric Surge
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Wild Charge
- U-turn
- Hidden Power [Ice]
- Roost

Tangrowth @ Assault Vest
Ability: Regenerator
EVs: 136 HP / 44 Atk / 76 SpA / 252 SpD
Sassy Nature
- Knock Off
- Earthquake
- Giga Drain
- Hidden Power [Electric]

Mew @ Leftovers
Ability: Synchronize
EVs: 116 HP / 16 Def / 184 SpA / 36 SpD / 156 Spe
Modest Nature
IVs: 0 Atk
- Defog
- Toxic
- Volt Switch
- Earth Power

Kyurem-Black @ Expert Belt
Ability: Teravolt
EVs: 76 HP / 252 Atk / 136 SpA / 44 SpD
Quiet Nature
- Ice Beam
- Fusion Bolt
- Earth Power
- Outrage