'C', 'B', 'A', 'UP', 'Left Shift'.
Then, release them in this order:
'A', 'B', 'C', 'Left Shift', 'UP'.
During the game, press and hold 'A', 'B', 'C', 'UP' .... and then press 'Left Shift'.
Now, press 'B', 'A', 'B', 'Y', then hold 'X'.
Now press 'UP', then hold 'Down' and release 'X'.