Gengar was doing what it normally would do on days like these, hope that there is some foolish sol wandering near that could be controlled. So far, Gengar hasn't found a single spirit to manipulate, and has only been a Gengar for two weeks. He had nothing better to do, he didn't need to search for prey, not that he'd be able to find any, there weren't any living things in this desert except for Gengar himself. Gengar spotted a small pit in the plane of sand about a thousand feat ahead.
When Gengar arived at the pit he found a small ball in it, half red, half white, about one inch in diameter. He reached down to pick it up and noticed a small spot on it that seemed somehow different, and when he placed his hand on that spot, it grew, to the size of an orange. Gengar found this very amusing, as well as the though of thinking of how it could have ended up here.
The thought of how the magic orb got here was not as hard to fathom as the thought of how he himself could have come to the desert. He hardly remembered what life was like before the desert.
He used to live in a city, well, under a city, as a Ghastly. He never actually haunted anyone, yet the people of the city wanted him gone, and chased him down to a single location, he could have easily escaped, but just as he was about to, he saw someone trow a dark round... something, at him, and he blacked out. He awoke in the desert, and the thought of this made him drop the magic orb, as he realized a similar device was used to bring him here.