Just 1 Mega Steelix Raid & Mega Evolving Shiny Steelix in Pokemon GO

Shiny mega Pokémon

Steelix Pokédex: stats, moves, evolution & locations

Mega Construx Pokemon Onix Master Battle

Soilix Onix Pre Evolution by Hyperagua on DeviantArt

Mega Crystal Steelix, Pokemon Wack Wiki

Pokémon X and Y: Best Teams, How to Level Up, Mega Evolutions

Mega Steelix, Pokédex

Pokemon 10208 Shiny Mega Steelix Pokedex: Evolution, Moves, Location, Stats

Elite Trainer Mark on X: Onix was Brock's first ever Pokémon. However, it didn't even evolve under his ownership, it evolved into Steelix while his brother Forrest was taking care of it.

Pokemon Mega Construx Onix Master Battle Set