Clamperl @ Deep Sea Tooth  
Ability: Rattled  
Tera Type: Water  
EVs: 4 HP / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Shell Smash  
- Surf  
- Ice Beam  
- Hidden Power [Grass]  

Pelipper @ Heavy-Duty Boots  
Ability: Drizzle  
Tera Type: Water  
EVs: 248 HP / 252 Def / 8 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Tailwind  
- U-turn  
- Roost  
- Defog  

Araquanid @ Custap Berry  
Ability: Water Bubble  
Tera Type: Water  
EVs: 248 HP / 252 Atk / 8 SpD  
Adamant Nature  
- Sticky Web  
- Liquidation  
- Leech Life  
- Endure  

Swampert-Mega @ Swampertite  
Ability: Swift Swim  
Tera Type: Water  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Stealth Rock  
- Flip Turn  
- Earthquake  
- Ice Punch  

Basculegion-F (F) @ Choice Specs  
Ability: Swift Swim  
Tera Type: Water  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
- Shadow Ball  
- Surf  
- Ice Beam  
- Flip Turn  

Manaphy @ Waterium Z  
Ability: Hydration  
Tera Type: Water  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psychic  
- Surf  
- Tail Glow  
- Rest