Aegislash @ Ghostium Z  
Ability: Stance Change  
Level: 50  
EVs: 252 HP / 252 SpA / 4 SpD  
Quiet Nature  
IVs: 0 Atk / 0 Spe  
- Flash Cannon  
- Wide Guard  
- Shadow Ball  
- King's Shield

Unown
Options:
- offensive: Steel Beam, Close Combat, Shadow Sneak
- supportive: Substitute
- items: Steelium Z, Leftovers, Weakness Policy, Sitrus Berry

Unown
Offensive calcs:
- 252+ SpA Aegislash-Blade Shadow Ball vs. 4 HP / 0 SpD Tapu Lele: 144-170 (98.6 - 116.4%) -- 93.8% chance to OHKO
- 252+ SpA Aegislash-Blade Never-Ending Nightmare (160 BP) vs. +1 252 HP / 4 SpD Mega Reuniclus: 240-284 (110.5 - 130.8%) -- guaranteed OHKO
- 252+ SpA Aegislash-Blade Never-Ending Nightmare (160 BP) vs. 252 HP / 72+ SpD Mega Slowking: 252-296 (124.7 - 146.5%) -- guaranteed OHKO
- 252+ SpA Aegislash-Blade Never-Ending Nightmare vs. 252 HP / 4 SpD Mega Dhelmise: 282-332 (159.3 - 187.5%) -- guaranteed OHKO
Defensive calcs:
- 252+ SpA Mega Gengar Shadow Ball vs. 252 HP / 4 SpD Aegislash-Shield: 138-164 (82.6 - 98.2%) -- guaranteed 2HKO