Yeah, I tried it tonight on a study break and it can be found on the wall in clear or sunny weather. Wind, rain, or thunderstorm and it isn't there. You'll also need the rose incense which can be obtained pretty easily by talking to the trainer standing in the grassy area above the peridot pokecenter after beating her. Not sure if it can still be found in the peridot grass in the morning but Notus' EV training guide doesn't indicate that it can and as I understand it that's using data from the game files.