Onix - Ah Negão!

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

Onix (56/95) [HeartGold & SoulSilver: Unleashed]

Onix - 57/95 - Common - Reverse Holo

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

Onix - 56/95 - Common Reverse Holo

Auction Item 393546945799 TCG Cards 2010 Pokemon Heartgold & Soulsilver Unleashed

Pokemon HeartGold Version - ds - Walkthrough and Guide - Page 8 - GameSpy

2010 Pokemon onix #56 Heartgold & Soulsilver Rev. Foil unleashed KSA 9 Mint

Onix, Sorcerers Wiki

Pokemon HeartGold and SoulSilver :: The Johto Safari Zone