There are 7 Diglett to find in Loop Lagoon.
Alolan Diglett #1
This Diglett is on the central island with the archway. It is hidden in front of the cliff near the tree.
Alolan Diglett #2
This Digglet can be found hiding by a bush along the cliff’s edge by the entrance to Courageous Cavern.
Alolan Diglett #3
Diglett #3 is on the central island with the archway. It is by the Berry Tree near the edge.
Alolan Diglett #4, #5
These two Diglett are hiding along the shoreline near the entrance to Courages Cavern. If you were to exit Courages Cavern into Loop Lagoon this beach is to your right. One Diglett is by the water and the other by the cliff.
Alolan Diglett #6
This Diglett can be found at the tip of the beach opposite the entrance to Courages Cavern.
Alolan Diglett #7
Diglett #7 can be found hiding in the grass along the waters edge just before the shore. The shore is opposite Courages Cavern.