Official save game files are often shared by the community on legacy gaming sites and forums. You can typically find "100% complete" save files at the following locations:

For fans of classic racing, finding is the fastest way to skip the grind and jump straight into legendary tracks with fully upgraded bikes and riders. This 2003 title from THQ remains a nostalgic favourite, but unlocking every challenge can be time-consuming. Where to Find MotoGP 2 Save Game Files

If you prefer not to download external files, you can manually "unlock everything" by editing the game’s configuration file: Navigate to your MotoGP 2 installation folder. Open the motogp.cfg file using Notepad. Add the following lines to the end of the file: debugcheat/lullbullbydub = true game/simbase/medium = 0.0 game/simbase/hard = 0.0 game/simbase/legend = 0.0