Dragon/Fighting is kinda redundant (Did I use that word right?) now because of the fairy type. --- "The best part about the internet is that you can make up quotes"George Washington Official Shadow Zangoose of the X board and WF!
Both, Dragon/Ghost and Dragon/Fighting. But since your list did not include the former, I'll vote for the latter...for now.
EDIT: Ah crap, forgot about Giratina...but I meant a non-legendary one, so...still counts. --- "Many of you feel bad for this lamp...That is because you're crazy. It has no feelings! And the new one is much better." (IKEA's Lamp commercial)