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The way through the Seafoam Island caves is full of twists and turns, and you'll have to puzzle your way through to reach the south side of the island. Use the maps on this page to negotiate your way through the treacherous underground pathway. If you leave the cave before you find the southern exit, all of the puzzles will reset.

Only the strong may enter[edit]

Seafoam Island 1F

Don't even enter the Seafoam Islands unless you have a Pokémon who knows the Strength technique. You'll need his might to knock the two sets of boulders on the first floor and the third basement into the lower floors, blocking the current so you can swim safely.

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, the only actual prize in this dungeon. 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 save the game before you fight Articuno. You should bring a lot of Ultra Balls, but this fight will be much easier than the last one, thanks to Zapdos' ability to knock Articuno near the red zone with just two Thundershocks.

Rock & Roll[edit]

As you descend, use your Strength to roll the loose boulders into the dark pits. The idea is to use the boulders to block the river in B3 — if you don't block the river first, the current will sweep you down to B4. Once the current is blocked, cross over to the right side of level three and climb up the ladder marked H on the map. Keep climbing up the ladders until you reach Floor 1 again and the southeastern exit. Also, there is a hidden Nugget by the boulder you cannot move in Basement 2.

Plan carefully[edit]

Seafoam Island B1F
Seafoam Island B2F
Seafoam Island B3F

Strength alone is not enough to solve the mystery of the boulders in the lower-left corner. You must also use your brain. Push the right-most boulder all the way up, and push the boulder directly under the ladder marked F to the left. Push the boulder above the left pit down. Return to the first boulder, and stand above the one that was next to it. Push it down one square, then push it two spaces to the left, and push it down once more into the pit. When you're done, jump into the pit yourself. The current should be blocked, and you'll be able to reach Articuno.

There is a hidden Max Elixer on the rock below the right-most boulder.

Blockade runner[edit]

Seafoam Island B4F

To reach Articuno, first climb down to the third level and roll a boulder into each of the two pits in the lower-left corner. This will block the river on the level below and keep you from being swept away. Take the ladder marked G on the map to the next level down. Use the Surf ability to enter the river on the left. Paddle north until you come to a stone platform. If you want to capture Articuno, it is recommended that you use Ultra Balls and Sleep-inducing attacks.

There is a hidden Ultra ball on the lone piece of land in the bottom-right of B4F.

Pokémon found[edit]

1F[edit]

Red
Pokémon Level Rate
Zubat Zubat 21 10%
Golbat Golbat 29 5%
Psyduck Psyduck 28 5%
Golduck Golduck 38 1%
Slowpoke Slowpoke 30 20%
Seel Seel 30 19%
Shellder Shellder 28,30 20%
Horsea Horsea 28,30 20%
Blue
Pokémon Level Rate
Zubat Zubat 21 10%
Golbat Golbat 29 5%
Psyduck Psyduck 30 20%
Slowpoke Slowpoke 28 5%
Slowbro Slowbro 38 1%
Seel Seel 30 20%
Krabby Krabby 28,30 20%
Staryu Staryu 28,30 19%
Yellow
Pokémon Level Rate
Zubat Zubat 9,18,27,36 50%
Golbat Golbat 27,36 5%
Slowpoke Slowpoke 28,30 15%
Krabby Krabby 25,27 30%

B1F[edit]

Red
Pokémon Level Rate
Slowpoke Slowpoke 28,30 15%
Seel Seel 28,30 15%
Dewgong Dewgong 38 4%
Shellder Shellder 32 15%
Horsea Horsea 30,32 30%
Seadra Seadra 37 1%
Staryu Staryu 30 20%
Blue
Pokémon Level Rate
Psyduck Psyduck 28,30 15%
Seel Seel 28,30 15%
Dewgong Dewgong 38 4%
Shellder Shellder 30 20%
Krabby Krabby 30,32 30%
Kingler Kingler 37 1%
Staryu Staryu 32 15%
Yellow
Pokémon Level Rate
Zubat Zubat 18,27,36 45%
Golbat Golbat 27 10%
Slowpoke Slowpoke 29 10%
Seel Seel 22,26 5%
Krabby Krabby 26,28 25%
Kingler Kingler 28 5%

B2F[edit]

Red
Pokémon Level Rate
Golbat Golbat 30 4%
Slowpoke Slowpoke 30,32 30%
Slowbro Slowbro 37 1%
Seel Seel 30,32 35%
Shellder Shellder 28 5%
Horsea Horsea 28,30 15%
Staryu Staryu 30 10%
Blue
Pokémon Level Rate
Golbat Golbat 30 4%
Psyduck Psyduck 30,32 30%
Golduck Golduck 37 1%
Seel Seel 30,32 35%
Shellder Shellder 30 10%
Krabby Krabby 28,30 15%
Staryu Staryu 28 5%
Yellow
Pokémon Level Rate
Zubat Zubat 27,36 40%
Golbat Golbat 27,36 15%
Slowpoke Slowpoke 31 4%
Slowbro Slowbro 31 1%
Seel Seel 24 10%
Krabby Krabby 27,29 20%
Kingler Kingler 28 10%

B3F[edit]

Red
Pokémon Level Rate
Slowpoke Slowpoke 31,33 35%
Seel Seel 31,33 30%
Dewgong Dewgong 37 1%
Shellder Shellder 29,31 15%
Horsea Horsea 29,31 15%
Seadra Seadra 39 4%
Blue
Pokémon Level Rate
Psyduck Psyduck 31,33 35%
Seel Seel 31,33 30%
Dewgong Dewgong 37 1%
Krabby Krabby 29,31 15%
Kingler Kingler 39 4%
Staryu Staryu 29,31 15%
Yellow
Pokémon Level Rate
Zubat Zubat 27,36 25%
Golbat Golbat 27 25%
Seel Seel 26,30 15%
Dewgong Dewgong 28,32 5%
Krabby Krabby 29,31 20%
Kingler Kingler 30 10%
Surfing
Tentacool Tentacool 20,25,30,35,40 70%
Staryu Staryu 20 30%
Red and Blue
Pokémon Level Old Rod Good Rod Super Rod
Magikarp Magikarp 5 100% - -
Poliwag Poliwag 10 - 50% -
Goldeen Goldeen 10 - 50% -
Shellder Shellder 15 - - 25%
Horsea Horsea 15 - - 25%
Goldeen Goldeen 15 - - 25%
Staryu Staryu 15 - - 25%
Yellow
Pokémon Level Old Rod Good Rod Super Rod
Magikarp Magikarp 5 100% - -
Poliwag Poliwag 10 - 50% -
Goldeen Goldeen 10 - 50% -
Krabby Krabby 25 - - 40%
Kingler Kingler 35 - - 20%
Staryu Staryu 20,40 - - 40%

B4F[edit]

Red
Pokémon Level Rate
Golbat Golbat 32 1%
Slowpoke Slowpoke 29,31 15%
Slowbro Slowbro 39 4%
Seel Seel 29,31 15%
Shellder Shellder 31,33 30%
Horsea Horsea 31,33 35%
Blue
Pokémon Level Rate
Golbat Golbat 32 1%
Psyduck Psyduck 29,31 15%
Golduck Golduck 39 4%
Seel Seel 29,31 15%
Krabby Krabby 31,33 35%
Staryu Staryu 31,33 30%
Yellow
Pokémon Level Rate
Zubat Zubat 36,45 20%
Golbat Golbat 27,36 30%
Seel Seel 28,32 20%
Dewgong Dewgong 30,34 5%
Krabby Krabby 30 15%
Kingler Kingler 32 10%
Surfing
Tentacool Tentacool 20,25,30,35,40 70%
Staryu Staryu 30 30%
Red and Blue
Pokémon Level Old Rod Good Rod Super Rod
Magikarp Magikarp 5 100% - -
Poliwag Poliwag 10 - 50% -
Goldeen Goldeen 10 - 50% -
Shellder Shellder 15 - - 25%
Horsea Horsea 15 - - 25%
Goldeen Goldeen 15 - - 25%
Staryu Staryu 15 - - 25%
Yellow
Pokémon Level Old Rod Good Rod Super Rod
Magikarp Magikarp 5 100% - -
Poliwag Poliwag 10 - 50% -
Goldeen Goldeen 10 - 50% -
Krabby Krabby 25 - - 40%
Kingler Kingler 35 - - 20%
Staryu Staryu 20,40 - - 40%

New Pokémon[edit]

#87 Dewgong
Pokemon 087Dewgong.png

You can catch the fairly uncommon Dewgong (and its awkward unevolved form, Seel) in the Seafoam Islands, but you would be better off trading for one at Cinnabar Island. Being traded Pokemon, the Dewgong (Yellow) or Seel (Red/Blue) available at Cinnabar will gain experience 50% faster, making it a lot better at catching up to the rest of your team. While it has a lot of competition, its boosts to Water and Ice-type attacks give it an advantage over Blastoise and Articuno, and it hits significantly harder than Cloyster as well. Access to Horn Drill secures Dewgong's place as one of the best in-game Pokemon in Red, Blue and Yellow. As mentioned though, don't catch one; go trade for one.

#144 Articuno
Pokemon 144Articuno.png

If you use some Electric attacks to soften it up a bit, Articuno should give you much less trouble than Zapdos did. Just beware you don't overdo it — Zapdos' Thunder attack can kill this legendary bird in one shot! Once it's in the red zone, it could still take dozens of tries before Articuno goes quietly into a Poké Ball, so try to put it to Sleep or Paralyze it if possible.

Like Zapdos, level 50 Ice/Flyer Articuno has strong stats and learns his best technique (Blizzard) at level 51.