Extremely rare.
If your starter was: Charmander: Articuno Moltres Zapdos Mewtwo Suicune Squirtle: Articuno Moltres Zapdos Mewtwo Raikou Bulbasaur: Articuno Moltres Zapdos Mewtwo Entei
mewtwo, articuno, zapdos and moltres
Mew, Mewtwo Moltres, Zapdos, Articuno, and Cyndaquil.
Yes Zapdos is a legendary as well as the other two elemental birds Articuno and Moltres.
I don't know how rare they are, but my fried gave me a articuno a zapdos from China. I think I saw those three in some Pokemon card pack.
You can't unless you want to go to get Zapdos, Articuno, or Moltres. Zapdos - Powerplant Moltres - The Cave near island 1 Articuno - Seafoam island Articuno is pretty hard to find the sea foam island while Zapdos and Moltres are much simpler*
Kyogre, rayquaza if you have vba emulaor zapdos, moltres, articuno, lugia and more.
The legendaries are Missingno., 'M, Zapdos, Articuno, Moltres, Mew and Mewtwo.
articuno zapdos moltres and mewtwo but you can also find mew, without gameshark or anything.
ho-oh, lugia, articuno, zapdos, moltres, entei, raikou, suicune, latias, kyogre, rayquaza
The following: Suicune, Raikou or Entei depending on your starter Mewtwo in CERULEAN CAVE Ho-oh and Lugia on EIGHT ISLAND Deoxys on NINE ISLAND Moltres, Zapdos and Articuno. Moltres is in Mt. Ember. Zapdos is in the Power Plant. Articuno is in Seafoam Islands.
well there is Ho-oh and Lugia and entei and suicune and raiku and celebi and zapdos and moltres mewtwo and mew and articuno!! :)