Well that photo is definitely interesting. A Stalker that can disguise itself and wants to be someone else? I think Nairek is definitely not guilty now but someone is obviously trying to frame her specifically with that note.

There aren't really any Pokemon that jump out as being able to disguise themselves... so my guess is they'd have to trick Pokemon into seeing things? Maybe it could be a psychic or ghost type.. or someone using that nightmare fuel stuff that has given some of us strange visions.