To get the ten secret chips, you must have two Gameboy Advances, two Mega Man Battle Network 2 games, and a link cable. Both games must have at least three stars next to their name. If you have four stars, the odds will be higher. Link up the games and go into Network. Save the game when prompted, then choose Netbattle (not Practice Battle). Battle the other person and get an S rank on them. This is done easier if one player allows the other to kill them. You will get a secret chip approximately every twenty battles. The secret chip you get will be random.