Great Legendaries: Articuno, Zapdos, Moltres, Mew, Entei, Raikou, Suicune, Lugia, Ho-oh, Groudon, Kyogre, Rayquaza, Deoxys, Dialga, Palkia, Giratina, Arceus, Cresselia, Darkrai, Regigigas, Zekrom, Reshiram, Kyurem, Cobalion, Terrakion, Virizion, Xerneas, Yveltal
Good Legendaries: Mewtwo, Celebi, Jirachi, Latios, Latias, Uxie, Azelf, Mesprit, Manaphy, Shaymin, Victini, Meloetta, Heatran
Ok Legendaries: Regice, Registeel, Regirock
Bad Legendaries: Torandos, Thunderos, Landeros (passable in Therian forms), Phione (like it even counts)