Generation 7 OU Extreme Offense Mega-Medicham

Greninja @ Life Orb
Ability: Protean
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Gunk Shot
- Dark Pulse
- Scald
- Ice Beam

Nihilego @ Choice Scarf
Ability: Beast Boost
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Sludge Bomb
- Power Gem
- Hidden Power [Ice]
- Thunderbolt

Magearna @ Choice Scarf
Ability: Soul-Heart
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Fleur Cannon
- Flash Cannon
- Ice Beam
- Volt Switch

Smeargle @ Focus Sash
Ability: Own Tempo
EVs: 252 HP / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Boomburst
- Stealth Rock
- Protect
- Sticky Web

Medicham-Mega @ Medichamite
Ability: Pure Power
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- High Jump Kick
- Ice Punch
- Poison Jab
- Zen Headbutt

Tapu Fini @ Leftovers
Ability: Misty Surge
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
IVs: 0 Atk
- Defog
- Haze
- Hydro Pump
- Nature's Madness