Palkia @ Choice Scarf  
Ability: Pressure  
Tera Type: Water  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Trick  
- Spacial Rend  
- Surf  
- Hydro Pump  

Basculegion (M) @ Waterium Z  
Ability: Adaptability  
Tera Type: Water  
EVs: 252 Atk / 252 Spe  
Adamant Nature  
- Agility  
- Wave Crash  
- Last Respects  
- Aqua Jet  

Arceus-Water @ Splash Plate  
Ability: Multitype  
Tera Type: Water  
EVs: 252 HP / 160 Def / 96 Spe  
Timid Nature  
IVs: 0 Atk  
- Calm Mind  
- Earth Power  
- Judgment  
- Recover  

Toxapex @ Mental Herb  
Ability: Regenerator  
Tera Type: Poison  
EVs: 252 HP / 228 Def / 28 SpD  
Bold Nature  
IVs: 0 Atk  
- Toxic Spikes  
- Recover  
- Haze  
- Scald  

Kyogre-Primal @ Blue Orb  
Ability: Primordial Sea  
Tera Type: Water  
EVs: 252 HP / 92 Def / 164 Spe  
Timid Nature  
IVs: 0 Atk  
- Calm Mind  
- Scald  
- Rest  
- Ice Beam  

Seismitoad @ Leftovers  
Ability: Water Absorb  
Tera Type: Water  
EVs: 252 HP / 4 Def / 252 SpD  
Careful Nature  
- Stealth Rock  
- Toxic  
- Earthquake  
- Refresh