Instructions
Capture a Scyther. Scyther can be found while wandering in Routes 210 and 215, most commonly in the morning.
Find a Steel Coat, a held item that can be found on the Iron Island. Steel Coats are sometimes held by wild Pokemon of the Steel type, such as Steelix, Magnemite, Beldum and Bronzor and their evolved forms.
Equip your Scyther with the Steel Coat and trade it to another player. When the other player receives your Scyther, it will evolve into Scizor.
Trade Scizor back into your game.