They lurk deep within caves—motionless, neither eating nor drinking. Why they don’t die is not known. Inside Shelgon’s armor-like shell, cells are in the midst of transformation to create an entirely new body. This Pokémon’s shell is extremely heavy, making its movements sluggish. Its armored body makes all attacks bounce off. The armor is too tough, however, making it heavy and somewhat sluggish.
Pokédex entry #372
Shelgon is a type dragon Pokémon that evolves from bagon and into salamence.
Shelgon in Pokémon GO
It's possible to hatch Shelgon from an egg?
No, Shelgon can't be hatched.
How many CP would Shelgon have after evolving?
If you’ve catched a Shelgon and you want to know how many points it would have after evolving, use this evolution calculator and find out easily. You just need to write your Bulbasaur CP and then click “Evolve”.