What are all the legendarys name?

Answer 1

It depends if you are talking about the ones found in a particular game, or whether you mean in the original pokemon, which generation, or black-and-white versions. Here are all the current ones;

Articuno, Zapdos, Moltres, Mew, Mewtwo, Entei, Raikou, Suicune, Lugia, Ho-oh, Celebi, Regirock, Regice, Registeel, Kyogre, Groudon, Rayquaza, Jirachi, Latias, Latios, Deoxys, Uxi, Mesprit, Azelf, Dialga, Palkia, Giratina, Manaphy, Phione, Heatran, Cresselia, Darkrai, Rotom, Regigigas, Shaymin, Arceus. (Not released yet) Reshiram, Zekrom, Victini, Cobalon, Terrakion, Virizion, Keldeo, Voltolos, Tornelos, Landlos, Melloeta, Genesect, and Kyurem.