I finally caught Entei, now the only legendary in the HG/SS games (meaning ones you can catch in the games) I don't have is Latios. I still need to find a way to get the others though (Latias, Darkrai, etc.).
Also, it was confirmed today that in North America all five Generation IV games (Diamond, Pearl, Platinum, HeartGold, SoulSilver) will be able to get Jirachi over the Nintendo Wi-Fi Connection from June 26 through July 16. It will be in a Cherish Ball and at level 5; it will know Wish, Confusion, Rest, and Draco Meteor. The original trainer will be SMR2010 with the ID number 06260. It will also unlock the Pokewalker Route Night Sky's Edge.