You can catch the three birds in platinum when u get the national dex and meet oak at pal park....after that go to eterna city go to the house near cycling road and professer oak wil be there and then talk to him
By migrating Deoxys or an event.
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.
after u find it on its island it roams shinno
seafome island
50
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.