Below is a guide on the locations of the 9 Digletts on Challenge Beach.
1., 2. & 3. On the side of the beach that is farthest from the tower near Courageous Cavern, one Diglett can be found in the sand and the other 2 can be found next to the giant rocks.
4. Hidden by a plant next to a small cliff wall near the Forest of Focus along the river
5. Next to a stand alone rock near the entrance to the Forest of Focus
6. On the right side of the tower behind a support platform
7. On the beach near Forest of Focus
8. Take the path that leads up near the Forest of Focus to find the Diglett in the grass near a patch of red flowers.
9. From the previous Diglett, continue towards the dead end containing a den and tree. The Diglett can be found behind the tree.
Click here for a guide on the Honeycalm Island Digletts!