Level 34
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Gastly evolves into Haunter at level 25 and then into Gengar when you trade it to another game.
You have to trade to another game to make it evolve.
To put things simply: Farfetch'd, or Ch'Ding, as yours happens to be nicknamed, doesn't evolve in any Pokemon game to date. Yup. Hope you didn't lose too much sleep over that, bud.
16.
'Nightmare' is not a pokemon in any game.