SOS Encounter: Malie Garden
Walk: Malie Garden (20%)
Gift: Heahea Beach (Only in Ultra Moon)
Its base catch rate is 100 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 Net Ball or Dive Ball.
Evolution: Dewpider → Araquanid (Level 22).
Araquanid in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)