The original game ran at 480x272 resolution. On a 1080p or 4K monitor, the game becomes a blurry mess. A custom texture pack does the following:
: A full mod package that updates battle animations, UI textures, and character models. How to Install Textures dragon ball z tenkaichi tag team textures download link
Double-check that your folder name exactly matches the Game ID found in the PPSSPP "Game Info" screen. The original game ran at 480x272 resolution