You can either trade an onix holding a metal coat or wait until Whitney calls you after a rematch between you and her
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You need to trade an Onix holding a Metal Coat.
you trade your onix with it holding a metal coat
it doesnt.....unless pokemon brings up the next pokemon and shows steelix's evolution
To get a Shedinja in Pokemon Heart Gold you must trade it from either Pokemon Ruby, Sapphire or Emerald. Jacko25
Of course