Let’s address the elephant in the room. Downloading a WWE SmackDown vs. Raw 2006 PSP highly compressed file from a random website is technically copyright infringement because the game is still owned by 2K Games (and originally THQ).
However, if you own the original UMD disc, creating a personal backup ISO and compressing it yourself is legal in many jurisdictions. We do not condone piracy, but we support preservation. If you cannot find a cheap physical copy, consider this article an educational guide on file formats. Wwe Smackdown Vs Raw 2006 Psp Highly Compressed
If you possess the compressed file, here is how to utilize it: Let’s address the elephant in the room
The game features a massive roster of superstars from both the SmackDown and Raw brands, divided by the Brand Extension era. Real PSP Console:
Because compressed files require more processing power to decompress, you may need to tweak settings in PPSSPP: