You can get Articuno in Pokémon Red, Blue, Yellow, Platinum, HeartGold and SoulSilver, in Red, Blue, Yellow, HeartGold and SoulSilver, you can find Articuno residing in the Seafoam Islands.
In Pokémon Platinum, Articuno starts roaming around the Sinnoh region once you've spoken to Professor Oak in his place in Eterna City after you have received the National Dex and beaten Cynthia.
In Diamond and Pearl you can't catch Articuno.
catch Zapdos or Articuno
you don't catch articuno in crystal but you can get one from red, blue or yellow.
The answer is here:How_do_you_catch_an_articuno_easily
You cant catch Articuno in Pokemon Crystal, only in Blue, Red and Yellow. But i am not sure about that.
seafome island
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MasterBall
You cannot catch Articuno in Pokemon Sapphire, but you can trade it from FireRed or LeafGreen.
You can't catch articuno in pearl unless you migrate it from firered or leafgreen.
go to seafoam island search for articuno wich is hard to find articuno so good luck
u can catch it when u catch articuno moltries and zapdos