Severed Grounds (SG) takes place in an alternate pokemon world where the regions are mysteriously levitating in the skies due to unknown as of yet reasons. Because of that, the people had to adapt and develop the technology needed to traverse the skies much earlier. Since then, they have invented engines that run on steam and oxygen, made sky boats, blimps, and planes at a quicker pace than the normal world would have.
SG takes place in the 1980's, a time before Pokeball technology, but after the age of Apricorns. This is the age of Capsules. Pokemon are treated like the other times, some are pets, others tools, others traveling companions and much much more.
Also in this time frame, scientist have developed and mass produced medicine that can unlock the hidden potential of humankind, ranging from simply giving one access to their own little pocket of space to store objects with their mind, to giving the consumer of the medicine the power of fire from their very own fingertips. These are dangerous, though and many do not take the medicine because of the risks of losing sanity or their lives.
The only region not suspended into free air is known as Hoenn. As always, no one really knows why it is the only one left below, but some speculate because of the ties the region has to the earth and the seas...
SG takes place in the region of Voultan, a modern and robust country known for being a famous trade route and pokemon unique only to this land.
All story stuff aside, Pokemon Sierra is a rather well made hack from pokecommunity. Or, well, I think the plot and fakemon are neat. I will not link it or anything, because I do not know if there are rules forbidding links to hacks and whatnot.