Ou #2 (best)

Greninja @ Life Orb
Ability: Protean
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Hydro Pump
- Ice Beam
- Dark Pulse
- Extrasensory

Aegislash @ Leftovers
Ability: Stance Change
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
- Flash Cannon
- King's Shield
- Toxic
- Shadow Ball

Medicham @ Medichamite
Ability: Pure Power
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Fake Out
- High Jump Kick
- Zen Headbutt
- Thunder Punch

Sylveon @ Leftovers
Ability: Pixilate
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
- Hyper Voice
- Wish
- Psyshock
- Toxic

Entei @ Choice Scarf
Ability: Pressure
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Extreme Speed
- Sacred Fire
- Iron Head
- Stone Edge

Chansey (F) @ Eviolite
Ability: Natural Cure
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Seismic Toss
- Toxic
- Soft-Boiled
- Heal Bell