Mega Man Star Force 2 - Burai (Rogue) DX

The battle with secret, V5 form of Burai. To unlock it you must go to Mega screen and press Select. On the next screen you have to input a special code (you can find every code needed on Gamefaqs). If input was correct, Omega-Xis will confirm you that SP form of some boss is changed to DX. Effect lasts until game is reset.