You can talk with the mysterious voice to check your progress with the characters, is not the most convenient guide, but at the same time I don't want to make the events like hidden behind some random corner of the world or an unnecessarily convoluted quest, so I don't like that you will need a constant reminder of what to do... but I guess that may change in the future, idk.
Saves should be compatible with any new update; I may change some of the map layout in the future, if so I will make it clear in the patch notes, but as a general advice, try saving inside a pokecenter.
1/4000 like in the last generations, but the lewdmons are shiny and IV looked, so you'll get nothing out of soft resetting them.