While there is no official WWE SmackDown vs. Raw 2013 released for the PSP (the official series ended with SmackDown vs. Raw 2011), the "solid feature" you are looking for is likely a modded ISO.
That said, these are the trusted sources known by the PSP modding community for clean, tested, highly compressed SVR 2013 ISOs: While there is no official WWE SmackDown vs
. Modders update the roster, entrance themes, and textures to reflect the 2013 season. Technical Breakdown: "Highly Compressed" ISOs All wrestlers + alternate attires
The "2013" or "WWE 13" versions found online for the PSP are community-made mods , typically built on the engine of WWE SmackDown vs. Raw 2011 Official WWE Games on PSP . Modders update the roster