Onix pre evolution: Stonix

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Splice Sheet 24 by ElementalHeroShadow2 on DeviantArt

Steelix Pokédex

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PBB - How to evolve Onix into Steelix

When should I evolve my Onix? – – #1 Official Stars, Business & People Network, Wiki, Success story, Biography & Quotes

Does Onix evolve into Steelix? - Quora

What is Onix's evolution chart? - Quora

Fakemon w/Feral

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How to evolve Onix into Steelix in Pokémon Brilliant Diamond and Shining Pearl - Gamepur

What Pokemon would you like to see get a prevolution/evolution, rather than get a mega? : r/pokemon