You can't get scizor on Pokemon leaf green. However, you can trade if you have Pokemon fire red.
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Pokemon number 123 is Scyther. Scyther is a bug and flying type Pokemon with swarm and technician abilities that evolves into Scizor.
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.
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
you can't get scizor and not even syther in Pokemon sapphire, only by trading