You should only download a Sonic Rivals 2 CSO PSP full file if you own a physical copy of the game (the UMD) or have previously purchased it digitally. This article is for educational and archival purposes regarding format conversion and emulation.
The existence of the file in the wild ensures that the voice acting, the specific mechanics of the "Tails vs. Rouge" campaigns, and the unique level designs are not lost to the obsolescence of the UMD format, which is notoriously prone to physical degradation. sonic rivals 2 cso psp full