Where is the black lightsaber crystal in star wars the force unleashed 2

u dont have to phisicly get it, theres a cheat, glitch watever u wanna call it, but idk if it works for wii. go into ur lightsaber thing, and click on either a single ou a double lightsaber, double if u want too. then press the arrow keys to shift thu them, black is last, and its disintigration. theres a chance it will make ur enemy disappear with a few hit ( NOTE: THIS DONT WORK ON BOSSES OR VADER), sorta like lvl 3 repulse