Kingdra @ Waterium Z  
Ability: Swift Swim  
Level: 50  
EVs: 4 HP / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Muddy Water  
- Protect  
- Hurricane  
- Hydro Pump

Unown
Options:
- offensive: Scald, Draco Meteor
- items: Dragonium Z, Life Orb
- Nature: Timid

Unown
Offensive calcs:
- 252+ SpA Kingdra Hurricane vs. 4 HP / 0 SpD Assault Vest Ludicolo: 76-90 (48.7 - 57.6%) -- 95.3% chance to 2HKO
- 252+ SpA Kingdra Hydro Vortex (185 BP) vs. 4 HP / 0 SpD Mega Metagross in Rain: 195-229 (125 - 146.7%) -- guaranteed OHKO
- 252+ SpA Kingdra Hydro Vortex (185 BP) vs. 4 HP / 0 SpD Mega Kangaskhan in Rain: 211-249 (116.5 - 137.5%) -- guaranteed OHKO
- 252+ SpA Kingdra Hydro Pump vs. 236 HP / 236+ SpD Incineroar in Rain: 198-234 (99 - 117%) -- 93.8% chance to OHKO

Unown
Useful partners:
- Rain setter: Mega Walrein, Mega Dhelmise, Pelipper, Politoed