I'm a noob at competitive battling, so please take that in mind when rating my team:
Sableye @ Sablenite
Ability: Prankster
EVs: 248 HP / 116 Def / 144 SpD
Careful Nature
- Knock Off
- Will-O-Wisp
- Recover
- Protect
Greninja @ Life Orb
Ability: Protean
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Blizzard
- Extrasensory
- Gunk Shot
- Hydro Pump
Lucario @ Focus Sash
Ability: Justified
EVs: 252 Atk / 4 SpA / 252 Spe
Hasty Nature
- Blaze Kick
- High Jump Kick
- Power-Up Punch
- Hidden Power [Grass]
Chansey @ Eviolite
Ability: Natural Cure
EVs: 248 HP / 8 Atk / 252 Def
Impish Nature
- Seismic Toss
- Soft-Boiled
- Protect
- Double-Edge
Celesteela @ Assault Vest
Ability: Beast Boost
EVs: 252 HP / 4 Atk / 252 SpA
Quiet Nature
- Air Slash
- Energy Ball
- Explosion
- Swagger
Amoonguss @ Assault Vest
Ability: Effect Spore
EVs: 248 HP / 252 SpA / 8 SpD
Modest Nature
IVs: 0 Atk
- Giga Drain
- Foul Play
- Clear Smog
- Sludge Bomb
Sableye @ Sablenite
Ability: Prankster
EVs: 248 HP / 116 Def / 144 SpD
Careful Nature
- Knock Off
- Will-O-Wisp
- Recover
- Protect
Greninja @ Life Orb
Ability: Protean
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Blizzard
- Extrasensory
- Gunk Shot
- Hydro Pump
Lucario @ Focus Sash
Ability: Justified
EVs: 252 Atk / 4 SpA / 252 Spe
Hasty Nature
- Blaze Kick
- High Jump Kick
- Power-Up Punch
- Hidden Power [Grass]
Chansey @ Eviolite
Ability: Natural Cure
EVs: 248 HP / 8 Atk / 252 Def
Impish Nature
- Seismic Toss
- Soft-Boiled
- Protect
- Double-Edge
Celesteela @ Assault Vest
Ability: Beast Boost
EVs: 252 HP / 4 Atk / 252 SpA
Quiet Nature
- Air Slash
- Energy Ball
- Explosion
- Swagger
Amoonguss @ Assault Vest
Ability: Effect Spore
EVs: 248 HP / 252 SpA / 8 SpD
Modest Nature
IVs: 0 Atk
- Giga Drain
- Foul Play
- Clear Smog
- Sludge Bomb