Only in Ultra Sun
Gift: Poké Pelago
You won't find Houndour in the wild in this game — you get it as a gift.
For the look, the best colour match is Repeat Ball or Luxury Ball.
Evolution: Houndour → Houndoom (Level 24).
Houndour in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)