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.
yes if you KO maybe lets say articuno you KO it and you wanted to catch it you still can just defeat the elite 4 again