6th Gen The ghost woman in the office room.

[Kyora]

I found her at 2:00 AM while exploring Lumiose. I freaked out, and checked on my Pokemon (I don't know why {XD}). Then I went to Hotel Richissime and found the girl with the elevator, who looks just like the Ghost Girl. o_O That caused wonderful dreams that night.

 

[Meksal]

I found her at 2:00 AM while exploring Lumiose. I freaked out, and checked on my Pokemon (I don't know why {XD}). Then I went to Hotel Richissime and found the girl with the elevator, who looks just like the Ghost Girl. o_O That caused wonderful dreams that night.

Well, it's normal to always check your pokemon. I would hate an event that replaced all your pokemon with lv 1 splash magikarps 0.o

 

[DoktorGilda]

Speaking of creepy stuff, check out what's behind the second timetable on the Lumiose train station.

(unless it has to do with post game stuff)

 

[Legendary_Trainer_Alexandre]

That Ghost Chick is the freakiest ♥♥♥♥ ever (yes, it even surpasses the Ghost Marowak battle in Gen I and that was freaky as hell)!

 

[Cilicica]

I think she's just some little extra thing in the game made to make us curious but in reality she won't serve any real purpose I believe. Similar to other occurrences in previous games; they were never really important. (except of course for the one having to do with the Lunar Wing)