So I have been playing this game earlier this year, and always interested to check the hidden grottoes. The thing is, when I quick save OUTSIDE the grotto before checking whatever’s inside of it, everything is fine - it changes the spawn and I can always soft reset it. However, when I saw the sprite of a mon that I want to cpature and quick saved INSIDE, then interact with it and captured, the next refresh of the grotto would never spawn anything. And I already had a few grottoes that never spawned anything anymore since I did the quick saving INSIDE. Is this a bug? I never messed with the time and date in my PC and would let the time pass naturally. Thank you to whoever will respond to this.
Haven’t encountered that specific problem, but I recently had a bit of an issue with another time mechanism. Just in case you haven’t tried it yet, consider re-downloading the game to revert any possible and unintended changes in the files.
Actually, I had this game reinstalled recently and nothing has changed. The same grottoes were never fixed and new additional ones are having the same issue.