Walkthrough: North of Route 13 is thee Haina Desert, a massive maze that eventually leads to the Ruins of Abundance, containing nothing but Items and Wild Pokemon. The navigation of the desert is done by each exit with each area having a set number of rocks. To get through to the Ruins of Abundance, you need to follow the rock paths of 2-1-4-3; however, the paths will not return you to the same part you entered from.
Wild Pokemon:
Walking (Levels 28-31): Sandile(70%), Dugtrio(30%)
Rustling Spots (Levels 28-31): Sandile(70%), Dugtrio(20%), Trapinch(10%)
Weather Battle (Levels 28-31): Castform, Castform, Castform, Gabite
Zygarde Cells: There is one Zygarde Cell found here.
Trainers: There are no trainers found here.
Items:
TM85 Dream Eater - Near Second Mudsdale Rocks
Max Elixir - Right Path
Comet Shard - In Middle of Mudsdale Rocks
Saftey Goggles - From Hiker At Night
Psychium Z - From Pedestal