Bruno's Onix, International Pokédex Wiki

Pokemon HeartGold and SoulSilver :: Full Walkthrough

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)

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

Twitch Plays Pokémon HeartGold / Awesome - TV Tropes

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

Onix, Sorcerers Wiki

Was playing Soul Silver and encountered a full odds shiny Onix while grinding on Victory road. : r/MandJTV

Pokemon HeartGold and SoulSilver :: The Johto Safari Zone