All codes are entered on the Character Select screen starting frmo the random box:

Select Arcade Mode. Pick either manual or auto, the press and hold A and B until the match starts to battle Akuma. To fight M. Bison, do the same except hold A, B, and Select.

Choose any mode you like and then go to random select. Wait until you see either Akuma and M. Bison. They ALWAYS appear after Sodom.

Put the cursor on the random select box on your side and hold L+R, then press:

Go to "Arcade Mode", select a character and all subsequent options, then hold L + R + B all the way through the "VS." screen. Akuma will trounce your opponent, and then go after you.

Put the cursor on the random select box on your side, and hold start, then press: Player 1: Down, Down, Left, Left, Down, Left, Left, then press Jab+Fierce or Short+Roundhouse
Player 2: Down, Down, Right, Right, Down, Right, Right, then press Jab+Fierce or Short+Roundhouse

Put the cursor on the random select box on your side, and hold start, then press: Player 1: Down, Down, Down, Left, Left, Left, then press Jab+Fierce or Short+Roundhouse Player 2: Down, Down, Down, Right, Right, Right, then press Jab+Fierce or Short+Roundhouse

Put the cursor on the random select box on your side, and hold start, then press:

Jab, Short, Forward, Roundhouse, Fierce, Strong
or
Fierce, Roundhouse, Forward, Short, Jab, Strong

Have two people join a game.
Player 1 should be on Ryu and Player 2 on Ken. Both should hold start, then press Up, Up, then release start. Player 1 press Up, Up, Jab and Player 2 press Up, Up, Fierce.

You can only fight Akuma on the first stage!

Note: Do not pick any of the secret characters.

Highlight the character you want to play. Press and hold down start, strong and forward and wait until Akuma

Select any character and do not lose a a single match (Note: you can lose at most one round as long as win the match and do not continue)