What level does Cubone evolve?

Cubone evolves into Marowak starting at Level 28.

Other information about Cubone:

It is #104 in the National Pokedex. It was introduced in the Generation 1 games (Red, Blue, Yellow), so it has been in all the games from the very beginning.

It is the Ground type. It is immune to Electric-type attacks, and resistant to Poison and Rock. It is weak against Water, Grass, and Ice attacks.