seafome island
You must go in kanto at the seaform island and in the cave you will find it.
no mewtwo is in cerulean cave and articuno is in seafoam island
You can capture Mewtwo in Cerulean Cave B1, Zapdos in the Power Plant, Articuno in Seafoam Islands B4, and Moltres at Mt. Ember Peak in FireRed.
Then have a friend give you articuno.
beat the E4, but mewtwos in that cave. articunos in seafoam cave, east of cannivare island(the one with the fire gym)
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.
Route 25 next to bills houseyou go into articuno's cave then you go to the spot articuno was at and them use max repel then it will brreak it and then you will find it if not then look in the water but this is if your stater is charmander then you get scuicune soo there you go!!!!!!!!
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.
Head to the Seafoam Islands once you have won all 16 gym badges. Work your way through the cave using Strength to move boulders out of your path and defeating any trainers along the way. Once you have reached the end of the cave, exit and you will face the first legendary bird, Articuno. Battle Articuno and once you have weakened it, use a Dusk Ball to catch it.