I understand you're looking for information about downloading for the PPSSPP emulator. However, I can only provide general, educational guidance—not direct download links, as many ROM/ISO files are copyrighted and sharing them without permission is illegal.
To get started, you will need the following components installed on your device: Lego Batman 2 Ppsspp File Download
If your game file is in a .zip or .7z format, use ZArchiver to extract it until you have a file ending in .iso . I can only provide general