I wish I came up with this idea for Halloween...oh well.
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Aegislash:
(Above is her in her armor, and the bottom is her without her armor and you will think she's male at first.)

Trevenant:

Gourgeist:

Decidueye:

Palossand:

Cursola:

Runerigus:

Dragapult:

Polteageist:

Sinistcha:

Basculegion:

Skeledirge:

Ceruledge:

Houndstone:

Annihilape:

Gholdengo:

Marshadow:

Hoopa:

Flutter Mane:
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And there.

Are there any ghost girls I missed?

If so, tell me and I'll add them in.