The whole ghost-type shtick is either about something possessed, out of a different realm or something "undead".
There are only a few exceptions that deal with something different; the somewhat ethereal and mystical nature of some animals; Decidueye and the Frillish line.
Koffing might have a galar-form. Although, if a Pokémon has a new evolution, it will probably only evolve from a Galar form to begin with.
In other words; a normal Farfetch'd wouldn't be able to evolve. A Galarian Farfetch'd would be able to evolve, though, like Galarian Zigzagoon. So, Koffing...
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