If you just caught Articuno, just go up all the upward- ladders until you get to the opening.
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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
This cave is where you can find Articuno. You'll have to go through a maze involving water that you have to use Surf on to find it.
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.
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For Pokemon Silver catch these three in the wild inside Mt.Silver. Go to the third section of the cave where you fight "RED" and run around until you find them. Zapdos can be caught in the "am" i believe since i got him between 11am and 12pm. Moltres can be caught at night. Articuno i have no idea since i have not yet caught him. actually zaptos is caught near the power plant and articuno is caught at sea foam island. Chobotboy Zapdos: Outside power plant Articuno: Icy bit at Seafoam islands Moltres: Mt. Silver cave, up waterfall