Gothitelle @ Colbur Berry  
Ability: Shadow Tag  
Level: 50  
EVs: 252 HP / 52 Def / 204 SpD  
Sassy Nature  
IVs: 0 Atk / 0 Spe  
- Psychic  
- Trick Room  
- Heal Pulse  
- Protect

Unown
Options:
- offensive: Psyshock, Foul Play
- supportive: Helping Hand, Fake Tears, Ally Switch, Imprison
- items: Wiki Berry, Kasib Berry, Sitrus Berry, Mental Herb

Unown
Defensive calcs:
- 252+ SpA Kingdra Hydro Vortex (185 BP) vs. 252 HP / 204+ SpD Gothitelle in Rain: 148-175 (83.6 - 98.8%) -- guaranteed 2HKO
- 252+ SpA Mega Charizard-Y Overheat vs. 252 HP / 204+ SpD Gothitelle in Sun: 150-177 (84.7 - 100%) -- 6.3% chance to OHKO
- -1 252+ Atk Mega Dhelmise Poltergeist vs. 252 HP / 52 Def Gothitelle: 152-180 (85.8 - 101.6%) -- 6.3% chance to OHKO

Unown
Useful partners:
- Perish Song: Mega Gengar, Politoed
- Trick Room abuser: Snorlax, Mega Mawile, Glastrier, Torkoal, Araquanid