Ok, to get this code to work, S.S. Anubis stage is the best. When 
standing in front of the Invincibility icon (don't get it), Let a 
person kill you so you fall back on it. You will have the shield on 
you until you press A. Once you have pressed A, your enemy will not 
be able to lock on you or hurt you until you get another Invincibility 
icon, this will be turned off.