In short,
You in a group of college students who were on a cruiseship that crashed mysteriously and were the only survivors, besides the captain. You were drifted onto the island of Sophrosune, which is a isolated region that is controlled by a slightly tyrannic authorative government, the AOS, who are currently battling the rising number of mauraders. The AOS controlled areas are bordered with a large barb-wire fence.
The plot is basically about the RP'ers exploring the region and uncovering its mysteries. And since they're stranded, anyone who wants to get off this island suppositively has to become the Pokemon Champion, battling ten of twenty different gyms and winning their badges.