Don't Go Insane, Joshua

Necrozma @ Leftovers
Ability: Prism Armor
EVs: 252 HP / 144 Def / 112 Spe
Bold Nature
IVs: 0 Atk
- Calm Mind
- Stored Power
- Morning Sun
- Iron Defense

Scizor-Mega @ Scizorite
Ability: Technician
EVs: 248 HP / 72 Def / 128 SpD / 60 Spe
Impish Nature
- Swords Dance
- Bullet Punch
- U-turn
- Roost

Tapu Fini @ Leftovers
Ability: Misty Surge
EVs: 248 HP / 184 Def / 16 SpD / 60 Spe
Calm Nature
IVs: 0 Atk
- Moonblast
- Nature's Madness
- Defog
- Taunt

Heatran @ Grassium Z
Ability: Flash Fire
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Magma Storm
- Solar Beam
- Earth Power
- Stealth Rock

Nihilego @ Life Orb
Ability: Beast Boost
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Sludge Wave
- Power Gem
- Hidden Power [Ice]
- Toxic Spikes

Dugtrio @ Focus Sash
Ability: Arena Trap
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Earthquake
- Reversal
- Screech
- Toxic