Mega Venusaur + Bronzong

Venusaur-Mega @ Venusaurite
Ability: Thick Fat
EVs: 232 HP / 180 SpA / 80 SpD / 16 Spe
Modest Nature
IVs: 1 Atk
- Hidden Power [Fire]
- Giga Drain
- Sludge Bomb
- Synthesis

Greninja @ Life Orb
Ability: Protean
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Spikes
- Hidden Power [Fire]
- Dark Pulse
- Hydro Pump

Bronzong @ Leftovers
Ability: Levitate
EVs: 252 HP / 160 Def / 96 SpD
Sassy Nature
IVs: 0 Spe
- Stealth Rock
- Gyro Ball
- Hidden Power [Ice]
- Earthquake

Thundurus @ Choice Band
Ability: Defiant
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Superpower
- Knock Off
- Wild Charge
- U-turn

Garchomp @ Choice Scarf
Ability: Rough Skin
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Outrage
- Stone Edge
- Poison Jab

Tapu Fini @ Icium Z
Ability: Misty Surge
EVs: 248 HP / 172 Def / 16 SpD / 72 Spe
Calm Nature
IVs: 0 Atk
- Haze
- Defog
- Moonblast
- Nature's Madness