Oh another thing about event pokemon. You pick them up at any Pokemart and they randomize right after you pick them up. That means you can stand in front of the delivery man and keep trying until you get a decent one. Just check it on an IV calculator like the one below.
http://www.serebii.net/games/iv-calcdp.shtml
http://www.serebii.net/games/iv-calcdp.shtml