Go to Last resort, then go north of it. you will see a patch of grass there. Don't go into the dark patches. The pokeradar can also help if you have it.
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Catch a Scyther. Then get a Metal Coat. Attach that to Scyther and then trade.
YOU cant actually find a scyther but you can do poketransfer on other Pokemon games like Pokemon heartgold and soulsilver.
You have to be able to trade scyther holding metalcoat to evolve it unless you use an AR to make it possible to find scizor in the wild
you can get scyther on route 11
Scyther was introduced in Generation I.