Only in Ultra Sun & Ultra Moon
SOS Encounter: Route 2
Static Encounter: Route 2
Surf: Route 2 (50%)
+ 1 more way
Its base catch rate is 255 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 Heal Ball, Master Ball or Dream Ball.
Evolution: Ekans → Arbok (Level 22).
Ekans in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)