Bruno's Onix - Bulbapedia, the community-driven Pokémon encyclopedia

I CAUGHT A SHINY ONIX

Young Couple Duff and Eda sent out ONIX and CLOYSTER! : r/theyknew

Pokémon Heart Gold & Soul Silver - Your Partner Pokémon

Onix generation 4 move learnset & egg move parents (Diamond, Pearl, Platinum, HeartGold, SoulSilver)

2010 Pokemon HeartGold and SoulSilver Unleashed #56 Onix, C, Non-Foil, cd1

Pokémon Adventures: HeartGold and SoulSilver, Vol. 1, Book by Hidenori Kusaka, Satoshi Yamamoto, Official Publisher Page

Onix (61/90) [HeartGold SoulSilver]

Pokemon HeartGold Version Box Shot for DS - GameFAQs

Pokemon Heartgold and Soulsilver In-Game Tier List (MkII), Page 9

Onix 57/95 Values - MAVIN