WWE ’12 on PSP originally ran at 30 FPS, but emulation can be choppy. Here’s how to optimize your experience:

An app like ZArchiver (Android) to extract the ISO file.

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Despite being a mod, the community-created WWE '12 for PSP offers a surprisingly robust experience:

WWE 12 is a professional wrestling game developed by Yuke's and published by THQ. Released in 2011, the game features a wide range of WWE superstars, including John Cena, The Rock, and CM Punk. The game was initially released for PlayStation 3 and Xbox 360, but with the help of a PSP ISO file, you can now play it on your PSP.

Before you search for a download, you must understand what you are looking for.