208 - Mega Steelix by Tails19950 on deviantART

9 Ways to Evolve Onix - wikiHow

Onix (Pokémon GO) - Best Movesets, Counters, Evolutions and CP

Steelix (Pokémon) - The Pokemon Insurgence Wiki

Steelix, Pokémon GO Wiki

May Mega Evolution Magic

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.

Pokémon Sword & Shield Pokédex •

Onix - XY: Evolutions Reverse Holo - Pokemon

Steelix Pokédex

which onix do I evolve and should I purify the one for a hundo mega steelix (for raids only btw) : r/pokemongo