Yes, Scyther will evolve in Pokémon Crystal however it needs to be holding the Metal Coat while you're trading it in order for it to evolve.
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In pokemon crystal Pigeotto evolve in 36lvl
No, Sneasel cannot evolve in Crystal.
You cannot evolve Misdreavus in Crystal.
You can evolve an onix and a syther, both you have to trade and trade back holding the item
Rhydon cannot evolve in Pokemon Silver/Gold/Crystal.