Might've been a Ghost Pokemon. I hear they like to hang around here and spook passerby...I've seen a lot of them around recently, so I'm pretty sure that they're popular in this city. Makes sense, considering the story behind this building...

[ Despite Kaori's squeal, Asuka doesn't even flinch. She's had to deal with much scarier things than a creepy buildi--

Oh, wait, it looks like this little guy wants to come out and play! ]

S-schiesse!

[ T-that scared her! ]