Its a matter of opinion, but if you honestly cant think of anything, me I would go with "Constrictr" because basically its a serpent.
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Level: Onix Evolves By Trading.
To evolve onix you must give it a metal coat then trade it and it will evolve
level it up
You need to give ONIX a METAL COAT to hold. Then trade him and he will evolve into a STEELIX.
give it a metal coat and trade it