Only in Sun & Moon
Gift: Poké Pelago
You won't find Metang in the wild in this game — you get it as a gift or by evolving Beldum (Level 20).
Looking for Metagross? It isn't found in the wild in this game — evolve Metang (Level 45).
For the look, the best colour match is Great Ball, Net Ball or Heavy Ball.
Evolution: Beldum → Metang (Level 20) → Metagross (Level 45).
Metang in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)