What are the best moves to teach Giratina?

The best moves for giratina for me are shadow ball, shadow force, earth power (change it for aura sphere at lv 90) and outrage if possible, if not, stick with dragon claw till you can teach it with tha move tutors eiter outrage or draco meteor... If you prefer earhtquakerather than earth power you can teach it that with the TM.