Gift: Iki Town (Only in Sun & Moon), Route 1 (Only in Ultra Sun & Ultra Moon)
You won't find Litten in the wild in this game — you get it as a gift.
Looking for Torracat? It isn't found in the wild in this game — evolve Litten (Level 17).
For the look, the best colour match is Luxury Ball or Repeat Ball.
Evolution: Litten → Torracat (Level 17) → Incineroar (Level 34).
Litten in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)