Pokémon FireRed and LeafGreen/Seafoam Islands

'The way through the Seafoam Island caves is full of twists and turns, and you'll have to puzzle your way through. The complex labyrinth of caves is one of the most intricate that you'll go through but also hides one of the most powerful allies available, the Legendary Bird Articuno.'

Seafoam Islands can't be cleared without a Pokémon that knows. The islands feature a boulders puzzle. Once solved, it permanently remains that way. Setting the boulders in the right place will halt the strong currents, allowing surfing the water.

After you enter the cave, go east and push the boulder into the hole to the north. Now go to the steps north of the entrance and go up. Grab the Ice Heal. Within this cave you'll get your first chance to find a, and more rarely, its evolution.

The legendary Pokémon resides in the depths of these caves. The two boulders on the first floor block the current on the third basement level, which makes it easier to get around, but is not necessary for catching Articuno. It's the two in the third basement that are important: knock the other boulders out of the way so you can get to the ones in line with the holes (if you mess up, leave this floor and they'll reset), then jump in after them, swim to the island in the northwest, and you'll find Articuno.

Save the game before facing Articuno. Capture it, as it's the only one and the only chance. Come adequately prepared, since legendary Pokémon are the most difficult Pokémon to obtain in terms of catch rate.

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Items

 * Ice Heal - near the northwest ladder

Pokémon found

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Items

 * Revive (B1F, on the center platform)
 * Water Stone (B1F, on the south-central area, accessed from B2F)

Pokémon found

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Items

 * Big Pearl (B2F, south of the central platform)

Pokémon found

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Items

 * Nugget - hidden on a rock, on the western platform

Pokémon found

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Items

 * Water Stone - hidden on a rock, near the western ladder
 * Ultra Ball - east of the southern sign