There is Articuno, found in Seafoam Islands, and Delibird, which is only available in SoulSilver
You can't. You must trade it from Red, Blue or Yellow.
Heart Gold or Soul Silver because it has 16 gyms, you can catch rare Pokemon such as mewtwo, and it has better graphics. Oh, and you also get a telephone in the game like you do in emerald version. But if you're an old fashion guy, get Pearl. In Pearl version you have a vs seeker, unlike Heart Gold or Soul Silver but in Heart Gold and Soul Silver people can call you on your telephone (in the game, not literally your phone and it's not real people that call you.) and you can find them, and battle them again. Anyway, here are the legendary Pokemon you can get in heart gold and soulsilver. You can get Kyogre in heart gold and Groudon in Soul silver. You can get Articuno, Zapdos, Moltres, Mewtwo, Lugia, Ho-oh (Yes, both of them in one game :) not Raquaza (unfortunately), Raikou, Suicune, Entei and I can't remember the rest. So go ahead and get Heart Gold and Soul Silver. Hope this helped :)
Articuno. Articuno is considered one of the strongest Ice Types.
Geodude evolves after level 35 in heart gold
In the seafoam islands in the same spot as the past games
Yes.
go to seafoam islands in kanto and go down the ice stairs
There is Articuno, found in Seafoam Islands, and Delibird, which is only available in SoulSilver
at the bottom you can find articuno (no idea where i used youtube) and at the top is the fire gym.
ho-oh, lugia, articuno, zapdos, moltres, entei, raikou, suicune, latias, kyogre, rayquaza
Must be traded from Blue, Red, or Yellow. Another way to obtain Articuno is to use Gameshark cheats.
seafoam islands
lugia, ho-ho, suicine, articuno, zapdos, moltres, mewtwo, Kyogre OR Groudon, Raikou, Entei, and Latias
rakiou, entei, suicune, ho-oh,lugia, kyogre,mewtwo,articuno,zapdos,moltres,rayquaza,and latias
Get it at seafoam islands where you get articuno
You can catch Articuno in the Seafoam islands (Kanto), Zapdos at the Power Plant (Kanto), and Moltres in Mt. Silver (Johto).