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

Utilities - Pokemon HeartGold & Soulsilver Multiple Tools

Pokémon HG/SS: The Best Rock & Ground-Types, Ranked – FandomSpot

Best Monotype Runs in Pokemon Gold, Silver, Crystal, HG, and SS

Cute Charm Glitch HeartGold Episode 4 - Union Cave and Shiny Onix Pokemon Hunt!

Where Is: Onix (Trade Pokemon) (Pokemon Heart Gold/Soul Silver)

Pokémon HeartGold Blog Chapter 24

Brock and Onix, Pokémon Masters 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

Pokémon Diamond & Pearl vs. Pokémon HeartGold & SoulSilver: Full Comparison - Cheat Code Central