It can be either, but its easier to do the move because when you have the item, your opponent will only throw stuff at you, anyway, to do the move, press block (default R2) just as your opponents hit lands, its a little tricky to get the timing right, so just press it alot and you'll eventually pass the mission...
Brawl FC: 1891-2896-6944
Rich's first ever Super Smash Bros Brawl Wi-Fi Opponent