Pokemon Platinum Part #5 - Coal Minin' Town

Onix Pokédex: stats, moves, evolution & locations

All Pokemon Light Platinum Cheats (Complete List)

Who decided that Onix should have a ridicuously difficult catch rate?

Does Onix evolve into Steelix? - Quora

Pokemon Platinum :: Full Walkthrough

How to evolve Onix into Steelix in Pokemon Brilliant Diamond Shining Pearl - Dexerto

I CAUGHT A SHINY ONIX

Following the Trend, here's every Pokemon you can get in Pokemon Platinum before the first gym. : r/pokemon

onix, geodude, roark, and cranidos (pokemon and 1 more) drawn by star_light

1999-2000 Pokemon Base Set 4th Print Onix 56/102 PSA 9 Mint