From The Pokemon Insurgence Wiki
Mimry Gardens is accessed through Mimry Cave in Settlement Foxtrot. It is home to a Delta Meloetta.
To get to Mimry Gardens:
- Obtain Meloetta's outside battle ability: Relic Song
- Proceed to the large, hollowed out, musical note statue in the southern-most section of Settlement Foxtrot
- Use Relic song on this statue a cave entrance will emerge
- Follow the newly found path and you will come out in Mimry Gardens
- Use the hiking boots to reach Delta Meloetta