Type: Steel/Ground
Classification: Iron Snake Pokémon
Height: 10.5m
Weight: 740kg
Ability: Sand Force
Steelix Mega Evolves into Mega Steelix. The cells within its body, crystallized by the energy produced from Mega Evolution, are stronger than any mineral and able to withstand any temperature. It moves incredibly slowly, but its strengthened body is also impervious to damage, and it lashes out at foes without flinching.
Its Sand Force Ability will increase the power of Rock-, Ground-, and Steel-type moves by 30% during the sandstorm weather condition. If Mega Steelix uses Iron Tail during a sandstorm, it will become pure destruction, thanks to the Sand Force Ability.
Reference and images: Serebii.net
Additional references, images, and information: pokemonrubysapphire.com