As you enter boss attack mode, press SELECT for X to have all his armor.
When you have enough Soul Chips to buy either of these modes from Iris' shop, buy whichever one you want, but DON'T SAVE. Instead, turn off the game, then turn it back on. When you get to the mode select screen, the mode will be there, but you won't have lost any Soul Chips.
During the middle of the Berkana stage as x, you will have to air dash up on platforms. on the right wall, there should be a hole. Enter and you will get hado-ken and the upercut. THIS CODE REALLY WORKS!!!!!! use a game shark for invincibility.