Hmm.. Articuno, Zapdos, Moltres, Mewtwo, Mew, Raikou, Entai, Suicune, Lugia, Ho-oh, Celebi, Regirock, Registeel, Regice, Latias, Latios, Kyogre, Groudon, Requaza, Jirachi, Deoxys, Uxie, Mespirt, Azelf, Diagla, Palkia, Heatran, Regigigas, Girantina, Cresslia, Manaphy, Darkrai, Shaymin, Acreus.
I probably left out a really obvious one lol.
Not positive on some of the orders, but this should be close. :)
Leaving out: Rotom, Spirtomb, and Phione since you can breed to make multiple ones, I don't consider them legendary.