Kumori Satosuke (Japanese: くもりサとすけ) is a member of Bulbapedia and a fan for more than 10 years of the franchise, since it's initial appearance in the United States on September 7th, 1998. He derives his user name from the missing-in-action father of Satoshi in the Izumo Saga of his unpublished fanfiction, Pocket Monsters Legacies (Japanese: ポケットモンスタア レガシス). He is not well known in the Pokémon Community due to his lack of fondness for messageboards, his inability to attend conventions or events, and his preference to avoid the internet culture and the life associated with it. Despite such, he spend quite a deal of time spent on his Pokémon Fanfiction, which can at best be considered a reinterpretation of the entire franchise through his own eyes. He has personally created 132 species of his own for usage in the Chokoh and Sheikoh regions where the Izumo Saga takes place.
Pocket Monsters Legacies
SPOILERS CONTAINED WITHIN
Pocket Monsters Legacies (Japanese: ポケットモンスタア レガシス), or PokéLeg for short, is an unfinished, unpublished work that is constantly expanding within the spances of Satosuke's mind, heart, soul, drawers, files, and computers. It is a retelling of Pokémon, starting from the very beginning, and following the journies of Satoshi and his companions. Yes, it does reference events of the anime quite a bit. Yes, it is heavily based on anime events, or at least parts of it. However, it is in essence a tale about the games, and the multitude of interesting tid-bits that reside within. In order to unify these elements, the story follows the journeys of a handful of different young travellers, and firmly plants itself as a story all of its own (rather than just an AU of the anime).
It also includes the Izumo Saga, which takes place in a handful of regions created by Satosuke, namely, Chokoh and Sheikoh, based after the Chūgoku and Shikoku regions respectively. These two regions would unite Johto to Hoenn, and finish the lower part of the Map of Japan as interpreted by Pokémon. It is in this Saga, however, that Satosuke's own original characters shine out the brightest, for much of it focuses on characters never seen in any canon.
The Izumo Saga also features a personal answer to the long-wondered question, "Who is Satoshi's father?" As the user's name implies, this man, Kumori Satosuke, is that answer. Who is he? Well, one would have to read the story to find out. Or follow the chapter summaries - which will all come in due time.