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THEORY TIME!
Notice how Kalos is the ONLY region without a Ghost specialist? Well, let's take a look at something real quick.
Sinnoh Region. As much as I hate it, it DID give us Fantina, the French-speaking foreigner who set up a gym in Hearthome City. And yes, she did pepper her speech with French in the games. For a while people were wondering what region she came from, or if it was just another case of "Oh thats just the localization team being silly Something Awful faggots."
Well, fastforward to 2013. And we get Kalos, THE Poke-France. Yes, at one point, the Kalos gym progression had Fantina as a Ghost leader. But then she left for Sinnoh, leaving a gap. What city was this gap in?
Lavarre City
That's where the most ghost types in Kalos can be found around. With the recent introduction of the Fairy-type, the Kalos league decided to give Fantina's old gym to an up and coming Fairy type specialist, and thus, Fairy replaced Ghost in the Kalos cycle, while Ghost became part of Sinnoh's cycle.
"But Fantina spoke English in the Japanese versions!" some of you might say. Well, Game Freak IS aware of some of the changes we make to our games, keep that in mind.