Giratina, Arceus, Dialga, Darkrai, Rotom, Regigigas, Palkia, Shaymin/Skymin, Cresselia, Mesprit, Phione, Heatran, Uxie, Azelf... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... Manaphy
In order from favorite to least favorite. And don't correct me on Rotom, because I don't want to hear it again, if it annoys you so much, then just ignore it because I'm tired of it. I can believe it's a legendary if you believe the Legendary Birds are legendaries, they have just as much in-game proof as each other.