Onix

Description
Onix resembles a giant chain of gray boulders, with a rocky spine on its head. The Pokémon has a magnet in its brain that serves as an internal compass. Onix's body becomes more rounded and smoother with age. A fully grown Onix measures almost 30 feet.

Location

 * 9724AE43977987A8DD6339_Large.jpg Pewter Gym: Boss (Uncatchable), Cutscene
 * Pewter Gym (Challenge Level): Boss (Uncatchable)
 * Mt. Moon 2: Boss (Uncatchable)
 * Rock Tunnel: (Catchable), Boss (Uncatchable)
 * Mystery Gift v3.1: 851r3b64a (Expired)
 * Pokemon Adoption: 1 SnD Coin (Ready For Battle Non-Shiny Pokemon)
 * Mt. Moon (Challenge Level): Boss (Uncatchable)

Shiny

 * Shiny Onix has a 0.0125% chance of appearing in the wild


 * Completing the Shiny Hunter 1 Achievement


 * Pokemon Adoption: 1 SnD Coin (Common Shiny Pokemon)
 * Rocket Hideout (uncatchable)

Shadow

 * Completing the Pewter Challenge achievement

Trivia

 * Onix has the second highest Defense Stat of all the Pokémon in the game.
 * Onix (along with Staryu ) is the first Shadow Pokémon to be in Ptd.
 * Shiny Onix is the first reward given by an achievement.