Gift: Route 8
You won't find Cranidos in the wild in this game — you get it as a gift.
Looking for Rampardos? It isn't found in the wild in this game — evolve Cranidos (Level 30).
For the look, the best colour match is Great Ball, Net Ball or Heavy Ball.
Evolution: Cranidos → Rampardos (Level 30).
Cranidos in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)