At the beginning of the game, set your name as "CLAFFORJ".
See your opponents arrows in realtime
Go in the option menu, then start the credits screen, wait until the programmer's names scroll, then hold these buttons L + R + Down then press Y. You will hear a sound validating the cheat. Note: It only works while the programmer's names scroll ! Now, start a normal game against the AI or against someone in Multiplayer WiFi, and you will see the opponents arrows in realtime.