Gift: Route 8
You won't find Tyrunt in the wild in this game — you get it as a gift.
Looking for Tyrantrum? It isn't found in the wild in this game — evolve Tyrunt (Level 39).
For the look, the best colour match is Luxury Ball, Timer Ball or Safari Ball.
Evolution: Tyrunt → Tyrantrum (Level 39).
Tyrunt in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)