Steelix lives even further underground than Onix. This Pokémon is known to dig toward the earth’s core. There are records of this Pokémon reaching a depth of over six-tenths of a mile underground. It chews its way through boulders with its sturdy jaws. Its eyes can see in the darkness underground. Tempered underground under high pressure and heat, its body is harder than any metal.
Pokédex entry #208
Steelix in Pokémon GO
It's possible to hatch Steelix from an egg?
No, Steelix can't be hatched.
Which are Steelix’s strengths and weaknesses?
Steelix is a ground and steel type Pokémon. ground type pokémons are strong against fire, electric, poison, rock, steel pokémons but weak against grass, bug pokémons. They are not affected by flying type pokémons. steel type pokémons are strong against ice, rock, fairy pokémons but weak against fire, ground, flying pokémons.