Press DOWN+A+B+C+D at the character selection screen.
As ''Round 1'' appears when you are fighting against Arina, press START+A+D and the lyrics will appear.
Press LEFT+START at the character selection screen to change the winning mark. If you did it right, a voice will be heard. To change the mark back to normal again, input the code once more.
Start a single-player game and have player 2 press start. Ferlandez and Bonuskun will now be selectable in VS mode. You must have the settings on console mode for this to work.