SOS Encounter: Route 2, Hau'oli City
Walk: Hau'oli City (25%), Route 2 (20%)
Its base catch rate is 200 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 Ultra Ball, Level Ball or Luxury Ball.
Evolution: Abra → Kadabra (Level 16) → Alakazam (Trade).
Abra in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)