To get into the Desert Ruins in Pokemon Ruby, Sapphire and Emerald you need to complete a puzzle. This puzzle is found in the Sealed Chamber hidden on Route 134.
There is a cave with 2 things next to it in the cave you will find red crayons also there is a lot to put a house on top of it the cave is in the desert.
A desert I think
The address of the Desert Foothills Library is: 38443 N. Schoolhouse Road, Cave Creek, 85331 8647
Island cave, Ancient Tomb, Desert Ruins, Sky Pillar, Terra cave, Marine cave, Cave of Origin.
Desert ruins, Ancient tomb, Island cave, Sky pillar, Cave of origin, Marine cave, Terra cave.
Assuming you have opened the regis caves, you can find its cave in the desert. The cave is at the north end of the desert. You can't miss it if you go down far enough, it should have six rocks in a circular pattern around the cave.
it is the fossil you didn't get in the desert
Caves that are in the desert which are formed by wind erosion
In the desert cave
Island Cave, Desert Ruins, Sky Pillar, Any route, Terra cave, Marine cave.
so you got to the desert, and go towards the back, and you'll find this cave. the cemetery is in front of the cave.
At the Anicent tomb, Sky pillar, Desert ruins, Island cave, Cave of origin.