to catch articuno easily you can weaken it and use a better version of pokeball like greatball,ultraball you buy them from the Pokemon market or find it master ball catches it no matter what but you can not buy that you can only find one or a go to saffron city and go to silph.co and save the old man on floor 11
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