Onix

Onix is a dual-type Pokémon of the Rock and Ground types. Known as the Rock Snake Pokémon, its body consists of a chain of boulders that become smaller towards the tail. Its head sports a long spine resembling a fin. The average Onix specimen reaches almost 29 feet in length, making Onix the tallest Pokémon out of all Rock-types.

Pokédex Data
Onix can be found in caves and subterranean areas. Throughout their lives, they burrow through the ground, inhaling rock and soil through their mouths and carving out long, winding tunnels. These tunnels make ideal habitats for Diglett.

Onix travel through the ground at 50 miles per hour, causing tremors throughout the terrain. Hard objects encountered while tunneling are absorbed into its body, which makes it very sturdy. It also consumes the boulders for food. The boulders that make up Onix's body become rounder and smoother as it grows older, becoming similar to black diamonds. Each segment of Onix's body, including its head, can rotate 360 degrees. Inside its brain is a magnetic ore fragment that serves as a form of compass.

Abilities

 * Bind - Onix wraps its serpentine body around the opponent, slowly squeezing the life out of them.
 * Dig - Onix can burrow through the earth at 50 miles per hour, causing powerful tremors that will knock enemies off their feet.
 * Screech - Onix emits an ear-splitting roar akin to rocks slowly scraping against one another, causing the opponent's defence to diminish sharply.
 * Rock Throw - Onix swings its tail to strike the opponent with the force of tumbling boulders.

Evolution
Trained Onix evolve into Steelix when traded whilst holding a Metal Coat. In the wild, only Onix that dwell within areas with high metal content may evolve.