Duosion @ Eviolite  
Ability: Magic Guard  
EVs: 252 HP / 252 Def / 4 SpA  
Bold Nature  
IVs: 0 Atk  
- Calm Mind  
- Psyshock  
- Signal Beam / Acid Armor
- Recover  

Duosion @ Eviolite  
Ability: Magic Guard  
EVs: 252 HP / 252 SpA / 4 SpD  
Quiet Nature  
IVs: 1 Atk / 30 Def / 30 SpA / 30 SpD / 0 Spe  
- Trick Room  
- Psyshock / Psychic
- Shadow Ball  
- Hidden Power [Fighting]

Additional Move Options: Toxic

Notes:
- Duosion is able to bypass Entry Hazards and Toxic, while using its defensive capabilities to set up Calm Mind and use Recover to set up and sweep.
- Signal Beam improves the matchup against Dark-types such as Shiftry and Liepard while still hitting Psychic-types for coverage compression.
- Preferably, late-game sweeping is possible when all Dark types and Knock Off users are out of play.