SOS Encounter: Paniola Ranch (15%), Poni Plains (15%)
Walk: Poni Plains (10%), Paniola Ranch (5%)
NPC Trade: Poni Gauntlet (Only in Ultra Sun & Ultra Moon)
Its base catch rate is 45 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 Safari Ball or Nest Ball.
Tauros in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)