Round select, invincibility, and unlimited time:
Press Right, Left, L, R, Up, Down, X, Y, Start at the title screen.

Invincibility and unlimited time:
Press Right, Left, L, R, Up, Down, B(2), Start at the title screen.

Round select:
Press Up, Down, L, R, Right, Left, A(2), Start at the title screen.

View ending:
Press X, B, Y, A, Up, Down, Left, Right, Start at the title screen.