You get it in the Bug Catching Contest
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Scyther evolves by trading it while it is holding a Metal Coat(item)
you can get scyther on route 11
Scyther was introduced in Generation I.
To get scizor in Pokemon gold you must trade a Scyther that is holding Metal Coat. Metal Coat can be attained on the S.S. Aqua after you defeat the Elite Four.
There isn't a trainer that has scyther.