Enter codes in the Codes screen, under options.
First, type in PEEKABOO in the codes section, and then go to create a player. Type in these names to get younger versions of these players; Michael Jordan, Scottie Pippen, Reggie Miller, Hakeem Olajuwon, Patrick Ewing, Shawn Kemp, and Karl Malone. These are higher rated versions of the players already in the game.