You're looking for a comprehensive guide on how to unlock all teams in "Winning Eleven 2002"!
Win the International Cup with Argentina.
Based on archived game guides (GameFAQs, 2003), the standard requirements are:
Classic teams feature legendary rosters from previous decades. To unlock them, you must win their respective regional cups with that specific nation: : Win the American Cup as Argentina. Classic Brazil : Win the American Cup as Brazil. Classic England : Win the European Cup as England. Classic France : Win the European Cup as France. Classic Germany : Win the European Cup as Germany. Classic Italy : Win the European Cup as Italy. Classic Netherlands : Win the European Cup as Holland. Unlocking All-Star & Regional Teams
Ensure you save your "Option File" after every tournament win to keep the teams unlocked permanently. If you'd like, I can: Provide the best player stats for these hidden teams.