The White Flag (ホワイト・フラッグ Howaito Furaggu?) is used by Amulet Angel to perform the defensive techniques.
White Flag Double Plan

White Flag: Double Plan! (weak)

White Flag has apparently been a useless move,although it protected Amu from Lunatic Charm's Dream Trident as seen in Volume 6 of the Manga. In the anime it was quite useless but in episode 42 it was changed into White Flag Double Plan which protected Amu from Utau.

Fanon Description by Caramelangel714Edit

As of the rebooted movie , all of Amulet Angel's techniques are more useless than all of the precise characters, especially, all of her Character Transformations' techniques are very weak.