find metal coat give it to syther then trade it
First, you need to get a scyther. You can get one from the Game Corner in Celadon City or from the Safari Zone. After catching one, find a metal coat. You can find that at the memorial pillar or the trainer tower in the sevii islands. Trade the scyther with it holding the metal coat and you have a scizor. Then, trade it back if you want it on your fire red game.
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Simply trade a scyther from firered while it holds metal coat to emerald you will receive a Scizor.
i recommend scizor because onix exist in both versions and therefore possible for both firered and leafgreen to have steelix. But, only firered possesses scyther and therefore, better for it
trade from firered and on firered you have to evolve scyther (which you can catch in the Safari Zone) by trading it with a metal coat
Scizor is a Steel and Bug type pokemon.
to evole the syther into scizor, trade scyther while it is holding a metal coat