This has worried me since I've discovered how to trigger the marriage of girls in Mineral Town and their rivals. (Viewing all the Rival Heart Events)
I've noticed on several walkthroughs, a specific [year] has been noted for the rival heart event to happen in.
Must you be in the noted year, or are the authors of these walkthroughs pointing out which year it happened to them in?
Thanks to all who are willing to help and do!