SOS Encounter: Haina Desert (10%)
Looking for Garchomp? It isn't found in the wild in this game — evolve Gabite (Level 48).
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 Great Ball or Lure Ball.
Evolution: Gible → Gabite (Level 24) → Garchomp (Level 48).
Gabite in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)