Some rare creatures only appear during the second or third "week" of the endless loop.
Note that progress is typically saved via Save Slots rather than automatically. Check the Crunchyroll Help Center for details on ensuring your progress is stored correctly. Gameplay Essentials File: Shin.Chan.Summer.Vacation.v1.0.zip ...
If you are working with a .zip file on PC, follow these standard steps: Some rare creatures only appear during the second