Only in Ultra Sun & Ultra Moon
Super Rod: Ancient Poni Path (10%), Poni Breaker Coast (10%)
Surf: Ancient Poni Path (20%), Poni Breaker Coast (20%)
SOS Encounter: Poni Breaker Coast
Its base catch rate is 225 out of 255 (higher is easier); the catch rate calculator works out your odds with each ball. For the look, the best colour match is Lure Ball, Great Ball or Quick Ball.
Evolution: Carvanha → Sharpedo (Level 30).
Carvanha in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)