I have an onix and I have the metal coat .then how do I evolve it?
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The only way Onix evolves into Steelix is through trading it with a Metal Coat equipped to it. It cannot Evolve through friendship.
And no, Steelix is still part ground, making it immune to electric attacks.
However, regular steel types ARE subject to electric attacks, but they won't be super effective. They will just do normal damage based on the power of the attack.
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