For a while now, you'd been noticing odd things happening around Lumiose. Not the usual things that have been popping up, the rouge megas, surges of mega energy, battle royale matches gone too far... no it's something else.
Out of the corner of your eye, you might spot a flicker of teal light, like the holograms of people you'd seen around. There'd be the distinct petals of a Roserade around your hotel room. The scent of expensive cologne lingering in the air that you know no one from team MZ uses. You know you recognize it though, you just can't exactly recall from where.
Finally, it clicks when you visit the Rust Syndicate to reset the EVs of one of your pokemon. The same cologne was far more prominent here and you suddenly had a clue to who your little stalker was. When you returned to Hotel Z that night, you fought off sleep for as long as you could, waiting in the dark to see if he'd show up. And low 'n behold, there's Corbeau, a hologram of him at least, flickering to life in your room.
Corbeau stares at you, frozen, his expression going stern. You'd finally figured him out, huh? It only took a month. Before you can even speak, the hologram vanishes, having been remotely turned off by Corbeau in his office, a hand covering his reddened face from both embarrassment and irritation. "Should've been more careful," He chides himself. How could he ever face you again?