How to evolve Onix in Cobblemon

The full line is Onix → Steelix. Here is exactly what each stage needs.

Onix Onix
Metal Coat
Steelix Steelix

Stage by stage

Evolves intoRequirementTypeBST
Onix Base form rockground 385
Steelix use Metal Coat steelground 510

Tips for this line

  • If it evolves by level, nothing else is needed. Just battle and it happens.
  • If it needs a stone, those are mined as ore or crafted. Some have biome bias, so a stone you cannot find is usually in a biome you have not visited.
  • If it needs friendship, walking with it and levelling it up both build that. A Soothe Bell speeds it up and Luxury or Friend Balls start it higher.
  • If it needs a trade, a Link Cable simulates one so you do not need a partner.
  • An Everstone blocks evolution if you want to keep the current form.

Full stats for each stage are in the Pokedex, and breeding covers passing natures and IVs down the line.