Tentacruel @ Black Sludge  
Ability: Liquid Ooze  
Tera Type: Water  
EVs: 252 HP / 16 Def / 240 SpD  
Sassy Nature  
IVs: 0 Atk / 0 Spe  
- Mirror Coat  
- Acid Spray  
- Toxic  
- Protect  

Lapras @ Choice Scarf  
Ability: Water Absorb  
Tera Type: Water  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Freeze-Dry  
- Thunder  
- Thunderbolt  
- Psychic Noise  

Greninja @ Choice Scarf  
Ability: Protean  
Tera Type: Water  
EVs: 4 Atk / 252 SpA / 252 Spe  
Hasty Nature  
- Dark Pulse  
- Grass Knot  
- Extrasensory  
- Gunk Shot