I don't know for sure , but due to pokemon X & pokemon Y, probuly somtime late 2013 or sometime in 2014.
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First beat the fourth gym as soon as you come out your rival i.e may if you have chosen a boy player will come out and give you the gogo goggles.now you can go into the desert
If your talking about the desert resort place in the battle frontier island, than all you do, is go south if you come in north and if you come in the south go north, the desert is must easier than others.
Route 111 (Desert)
Yes, but it could come back again. It will disappear permanently if you take a fossil.
A trainer with a solosis in Pokemon Black is found in the Desert Resort. The person that has it should be a doctor after you exit the gate to the Desert Resort.