Gren + Serperior

Greninja @ Life Orb
Ability: Protean
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
IVs: 0 Atk
- Extrasensory
- Hydro Pump
- Dark Pulse
- Spikes

Serperior @ Leftovers
Ability: Contrary
EVs: 56 HP / 200 SpA / 252 Spe
Timid Nature
- Substitute
- Leech Seed
- Leaf Storm
- Hidden Power [Fire]

Magearna @ Steelium Z
Ability: Soul-Heart
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Flash Cannon
- Aura Sphere
- Thunderbolt
- Shift Gear

Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 252 HP / 216 Def / 24 SpD / 16 Spe
Impish Nature
- Earthquake
- Stealth Rock
- Hidden Power [Ice]
- U-turn

Tapu Koko @ Choice Specs
Ability: Electric Surge
EVs: 4 Atk / 252 SpA / 252 Spe
Rash Nature
- U-turn
- Brave Bird
- Dazzling Gleam
- Thunderbolt

Blastoise-Mega @ Blastoisinite
Ability: Mega Launcher
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Hydro Pump
- Ice Beam
- Dark Pulse
- Rapid Spin