When you beat flannery in lavaridge town as you walk outside talk to professor birchs son or daughter and they will give the goggles to you to go into the deserts.
In the dessert. Route 111 (I belive)
route f
Route 111 (Desert)
in route 111 in the dessert
Find a Sandshrew in the desert at Route 111, 113, or the Mirage Tower, and evolve it into a Sandslash at level 22.
Route 111 (desert).
Route 111 in the desert c: *evolved hers into flygon*
Go to route 105, 111, or 120
Regirock is found in the Desert ruins in Route 111 on Pokemon Emerald. To access it you need to solve the Braille Riddle in the Sealed Chamber hidden on Route 134.
Route 111. Righ above where you smash the rocks above Mauville
In the deep sand in the desert. at route 111
that cave will open after beating the elite four near route 111