Where to find Onix in HeartGold & SoulSilver

Walk: Mt. Silver (40%), Safari Zone (30%), Mt. Silver Cave (30%) + 5 more
Trade: Violet City

• Cliff Cave — Walk
• Johto Safari Zone (Wasteland) — Walk
• Mt. Silver — Walk
• Mt. Silver Cave (1F, Lower Mountainside) — Walk
• Rock Tunnel (B1F) — Walk
• Route 47 — Walk
• Union Cave (1F, B1F, B2F) — Walk
• Victory Road (3F, 2F, 1F) — Walk

Onix in every game · Pokémon HeartGold & SoulSilver interactive map (Johto & Kanto)