I never use Ghost types, even though they're usually pretty good in competitive terms. (I don't normally battle competitively) Normal is not my cup of tea, either. Rock is also on this list, but Tyranitar and Archeops are exceptions.
I would've mentioned Poison here but I realized that I do use a lot of Poison-type Pokemon (because of secondary typing), including Roserade, Nidoking, and Crobat.