Yes, you can. If the Onix is holding a metal coat, it will not prevent you from trading it, and the recipient will receive a Steelix (because Onix being traded with a metal coat will make it evolve into a Steelix).
Scyther does not evolve by level. You must trade him while he's holding the metal coat.
Trade it holding a metal coat
You need to Trade Scyther whilst it's holding Metal Coat to evolve it into Scizor.To Recap:Scyther ---> Traded with Metal Coat ---> Scizor
You'll need to trade for it or trade for a Scyther holding a Metal Coat.
You need to trade an Onix holding a Metal Coat.
You have to trade it to another Pokemon game while it is holding a metal coat then trade it back and you will have it evolved.
Scyther evolves via trade holding a Metal Coat.
you need to link trade while its holding the metal coat
Scyther does not evolve by level. You must trade him while he's holding the metal coat.
You have to trade it while holding a metal coat.
Trade it holding a metal coat
Trade onix holding a metal coat
Trade a Scyther holding Metal Coat.
You need to Trade Scyther whilst it's holding Metal Coat to evolve it into Scizor.To Recap:Scyther ---> Traded with Metal Coat ---> Scizor
You'll need to trade for it or trade for a Scyther holding a Metal Coat.
Only if you trade it from heartgold with a Pokemon holding it
trade it while holding the twisted spoon