It depends which Pokemon you are talking about. here are some of them-
Misdreavius
Ghastly
Haunter
Mismagius
cofagrigus
yamask
shuppet
bannette
gengar
duskull
dusklops
dusknoir
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the ghost Pokemon in black and white are Frillish, Jellicent, Litwick, Lampent, Chandelure, Yamask, Golett, Golurk those are the only ghost type Pokemon in Pokemon black and white.
Im pretty sure ghost are weak against other ghost attacks and dark attacks.
Because Ghost Pokemon can't see in the dark.
Ghost-type Pokemon are weak against Ghost and Dark types.
Bianca