Since you used the term "solid paper," I assume you want a file that works without glitches. Look for a save labeled or "All Unlocked" . Ensure the Region of the save matches your game ISO (e.g., if you have the Japanese game, download the Japanese save, otherwise it will appear as "Corrupted Data").
In the early 2000s, gamers relied on memory cards to store their save data. These cards had limited storage capacity, and managing save data was a tedious task. Players had to manually delete old saves or use third-party devices to transfer data between consoles. For Battle Stadium Don players, this meant carefully managing their save data to avoid losing progress.
If you are looking for "paper" (likely referring to documentation, a guide, or a printable list) to help manage or unlock Battle Stadium D.O.N.
Most intriguingly, when dataminers finally cracked the save structure, they found ghost data. The save file contains placeholder flags for four additional characters not in the final game: Broly (DBZ) , Eneru (One Piece) , Kiba (Naruto) , and—strangely— Arale Norimaki from Dr. Slump.
Because the PlayStation 2 save data format requires a specific folder structure, you cannot simply download a single file. You usually need a folder containing a system configuration file and the save file itself.