Onix has a magnet in its brain. It acts as a compass so that this Pokémon does not lose direction while it is tunneling. As it grows older, its body becomes increasingly rounder and smoother.
Type: Rock/Ground
Category: Rock Snake
Ability: Rock Head, which protects the Pokemon from recoil damage. Or Sturdy, which enables the Pokemon to not be knocked out with one hit.
Hidden Ability: Weak Armor, where physical attacks to the Pokemon lower its Defense stat but sharply raise its Speed stat.
Weaknesses: Grass, Water, Fighting, Ground, Ice and Steel
Resistances: Normal, Poison, Flying, Rock and Fire
Immunity: Electric
Evolutions: It evolves into Steelix when traded holding a Metal Coat.
Height: 28′ 10″ Weight: 463.0 lbs
Pokémon Blog 
There’s a snake in my boot! Or was it a bunch of pebbles. xD
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Your boot must be HUGE if an Onix can fit in it XD
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Hehehehe! The rock snake will be outta there in no time.
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