Stumbled upon the crystal Onix in a nuzlocke run : r/pokemon

Onix (EX FireRed & LeafGreen 42) - Bulbapedia, the community-driven Pokémon encyclopedia

Onix

The Top 5 Best Fire-Type Pokémon FireRed and LeafGreen - Master Noobs

Pokémon Firered & Leafgreen In-Game Tier Discussion, Page 3

The Crystal Onix, Pokémon Wiki

Shiny Onix from Brock (This is an accidental shiny and looks like it's a 1/8192 chance like usual. I think you can shiny hunt the Pokemon of Gym leaders but I'm not

Pokemon FireRed ULTRAWIDE: Catching Onix (No Commentary)

Pokemon Crystal Flame Onix

Is Onix A Good Pokemon? Here's The Reality Check - Game Specifications

Doing my first ever nuzlocke on Fire Red, and think my luck just peaked. Brock's Onix just missed 4/6 Rock Tomb attempts to let my very type disadvantaged team pass through deathless