You have to have all 16 badges first. Then, you have to delve deep into the Seafoam Islands. You need strength, and at the very bottom lies Articuno.
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In Pokemon HeartGold and SoulSilver, you can find Articuno in the Seafoam Island cave. There is a small series of puzzles you have to solve, but eventually you'll get to Articuno which is at level 50
Yes, all 3 of them (Articuno, Zapdos and Moltres) will be in Pokémon HeartGold and Pokémon SoulSilver.
you don't catch articuno in crystal but you can get one from red, blue or yellow.
moltres=mt silver zapdos=powerplant articuno=seafoam islands you have to beat the 6th gym leader in kanto to catch em