Articuno, Zapdos, Moltres, Mewtwo, Suicune, Entei, Raikou and Lugia are the ones I've caught. Kind of a lame list, heh. However, in Crystal it seems that I can never have Raikou and Entei at the same time. :( In a game, if I find Raikou I can never find Entei, and vice versa.