Gigalith @ Weakness Policy  
Ability: Sand Stream  
Level: 50  
EVs: 228 HP / 124 Atk / 76 Def / 76 SpD  
Brave Nature  
IVs: 0 SpA / 0 Spe  
- Rock Slide  
- Trick Room  
- Stomping Tantrum  
- Protect

Unown
Options:
- offensive: Earthquake, Heavy Slam, Stone Edge, Explosion
- supportive: Wide Guard
- items: Sitrus Berry, Lum Berry, Rockium Z

Unown
Offensive calcs:
- +1 124+ Atk Gigalith Rock Slide vs. 4 HP / 0 Def Landorus-T: 81-96 (49 - 58.1%) -- 96.5% chance to 2HKO
Defensive calcs:
- 252+ SpA Tapu Lele Psychic vs. 228 HP / 76 SpD Gigalith in Sand: 81-96 (42.8 - 50.7%) -- 1.2% chance to 2HKO after Sitrus Berry recovery
- 252+ SpA Tapu Lele Shattered Psyche (175 BP) vs. 228 HP / 76 SpD Gigalith in Sand: 156-184 (82.5 - 97.3%) -- guaranteed 2HKO after Sitrus Berry recovery
- 252 Atk Urshifu-Rapid Strike Close Combat vs. 228 HP / 76 Def Gigalith: 156-186 (82.5 - 98.4%) -- guaranteed 2HKO after Sitrus Berry recovery
- 252+ Atk Water Bubble Araquanid Liquidation vs. 228 HP / 76 Def Gigalith: 162-192 (85.7 - 101.5%) -- 6.3% chance to OHKO

Unown
Useful partners:
- Sand abuser: Excadrill, Dracozolt
- others: Mega Hawlucha, Mega Salamence
- Trick Room abuser: Mega Mawile, Glastrier, Hatterene