Falinks @ Falinksite  
Ability: Defiant  
Level: 50  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
IVs: 0 SpA  
- Close Combat  
- No Retreat  
- Iron Head  
- King's Shield

Unown
Options:
- offensive: Rock Slide
- supportive: Swords Dance

Unown
Offensive calcs:
- 252 Atk Mega Falinks-Combat Iron Head vs. 252 HP / 4 Def Hatterene: 168-198 (102.4 - 120.7%) -- guaranteed OHKO
Defensive calcs:
- 252+ Atk Landorus-T Earthquake vs. 4 HP / 0 Def Mega Falinks-Legion: 120-144 (85.1 - 102.1%) -- 6.3% chance to OHKO

Unown
Useful partners:
- Ghost Pokémon: Spectrier, Dragapult