Some people found out that Island scans are based on day and location.
Reddit Thread: https://www.reddit.com/r/pokemon/comment...ylocation/
Link: http://www.serebii.net/sunmoon/dailyevent.shtml
Reddit Thread: https://www.reddit.com/r/pokemon/comment...ylocation/
Link: http://www.serebii.net/sunmoon/dailyevent.shtml