Please Help. My Hidden Grotto on Route 8 isn’t working. Is there a way to fix this?
If by ‘not working’ you mean you are unable to access Pokemon and items, then no. You can trade for the Pokemon you need here or on discord. Discord is recommended because there are more people.
Next time make sure you don’t forget to take the item/battle the mon before leaving the grotto, don’t save and exit the game while in the grotto, and don’t change your computer’s time, as these all are ways to break the grottoes and other time based activities such as the pokepon.