Pokémon of the Week - Steelix

3] Shiny Onix in Fire Red while looking for a Machop for my team! : r/ShinyPokemon

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

I Wanna Be The Very Best - Let's Play Pokémon Fire Red - Off-Topic - Kazamatsuri Forum

9 Ways to Evolve Onix - wikiHow

Brock-Pokemon Fire Red+Leaf Green by RubyUmbreon on DeviantArt

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

Pokémon of the Day - Steelix

Another funny run withnot so good pokemon except onix, he was terrible. - 9GAG

Pokédex - #095 Onix

Pokémon Adventures (FireRed and LeafGreen), Vol. 24, Book by Hidenori Kusaka, Satoshi Yamamoto, Official Publisher Page