Guilty Gear XX #Reload Cheats :
Secret - Easy way to use Instant Kill
At option, go to key confuguration. You will see PKSH is not used. Set the PKSH to any button. While fighting, press the button and press DOWN,RIGHT,DOWN,RIGHT (except for May and Dizzy). If you press the button the right way, your character will use a powerful move to DESTROY YOUR ENEMY!!!