Play as Bosses:|
To play as the bosses, choose "Team Edit" at the Character Selection screen. Now hold Start and press Up + Y, Right + A, Left + X, Down + B.
Play as Chizuru and Goenitz:
At the character selection screen, hold Start and press Up, Y, Right, A, Left, X, Down, B.
After your character dashes forward, immediately press Up-Left, then Forward (don't release). You should see your character run backward.