Use a community-reputed source like GameFAQs or the PCSX2 Reddit for verified repacks.
Example (NTSC-U – SLUS-21858):
You can find various formats of these saves on community hubs like 100% Complete (North America) : Files by users like often include everything unlocked and maxed items. Master Mode Starter naruto shippuden ultimate ninja 4 ps2 save data repack
, including methods for both physical PS2 consoles and PCSX2 emulators. Use a community-reputed source like GameFAQs or the