What is Onix's evolution chart? - Quora

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Answer (1 of 5): The Pokemon Onix evolves into one Pokemon called Steelix. A Steelix can also Mega evolve and change its apperance along with stats and effect. You evolve a Onix to a Steelix by trading it to someone while the Onix is holding the item, Metal coat. You will need to trade back for y

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