Reuniclus @ Reunite  
Ability: Overcoat  
Level: 50  
EVs: 252 HP / 52 Atk / 4 Def / 172 SpA / 28 SpD  
Quiet Nature  
IVs: 0 Spe  
- Psycho Boost  
- Trick Room  
- Superpower  
- Photon Geyser

Unown
Move options:
- offensive: Expanding Force, Shadow Ball
- supportive: Protect

Unown
Offensive calcs:
- 52 Atk Mega Reuniclus Superpower vs. 252 HP / 4 Def Stakataka: 168-196 (100 - 116.6%) -- guaranteed OHKO
- +1 172+ SpA Mega Reuniclus Psycho Boost vs. 252 HP / 0 SpD Mega Walrein: 216-255 (99.5 - 117.5%) -- 93.8% chance to OHKO
- +1 172+ SpA Mega Reuniclus Photon Geyser vs. 4 HP / 0 SpD Landorus-T: 169-201 (102.4 - 121.8%) -- guaranteed OHKO
- 172+ SpA Mega Reuniclus Psycho Boost vs. 252 HP / 252+ SpD Amoonguss: 218-258 (98.6 - 116.7%) -- 87.5% chance to OHKO
Defensive calcs:
- 252+ SpA Choice Specs Tapu Lele Dazzling Gleam vs. 252 HP / 28 SpD Mega Reuniclus: 186-218 (85.7 - 100.4%) -- 6.3% chance to OHKO
- 252+ SpA Aegislash-Blade Shadow Ball vs. 252 HP / 28 SpD Mega Reuniclus: 176-210 (81.1 - 96.7%) -- guaranteed 2HKO

Unown
Useful partners:
- redirection: Indeedee-F, Clefairy
- supplementary Trick Room setter: Porygon2, Stakataka, Hatterene
- Trick Room abusers: Araquanid, Lurantis, Glastrier, Cursola