it has to be in fire red, surf to soft foam island use every pokeball you got and if you have a great ball use it but if you can't catch it use master or ultra ball sorry but if you have six master balls don't use it save it for different and stronger pokemon.
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
MasterBall
50
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