Kanto field journalPokémon FireRed / LeafGreenGUIDES

Seafoam Islands FireRed & LeafGreen · Dungeon

Map of Seafoam Islands in Pokémon FireRed and LeafGreen
Seafoam Islands 1F (in-game map)

Seafoam Islands is a five-floor ice cave under Route 20, the sea route between Fuchsia City and Cinnabar Island. You can cross the sea around it, but this is where Articuno nests, deep on B4F, and you normally explore it when you are strong enough for the legendary bird. Strong currents on the lower floors are the puzzle, and you need both Surf and Strength to reach Articuno.

Wild Pokémon
12
Items
7
Trainers
0
Needs
Surf, Strength

Connects to: Route 20

Where Seafoam Islands is on the Kanto mapSeafoam Islands on the Kanto map

Gift and special Pokémon

Articuno Lv. 50 · One-off encounter · B4 F

Wild Pokémon

1F

Walking in the cave encounter rate 7
PokémonTypeLv.FireRedLeafGreen
ZubatPoisonFlying22–2634%34%
PsyduckWater26–3355%–
SlowpokeWaterPsychic26–33–55%
GolbatPoisonFlying26–3011%11%

B1 F

Walking in the cave encounter rate 7
PokémonTypeLv.FireRedLeafGreen
ZubatPoisonFlying22–2634%34%
PsyduckWater29–3140%–
SlowpokeWaterPsychic29–31–40%
GolbatPoisonFlying26–3011%11%
SeelWater2810%10%
GolduckWater33–355%–
SlowbroWaterPsychic33–35–5%

B2 F

Walking in the cave encounter rate 7
PokémonTypeLv.FireRedLeafGreen
ZubatPoisonFlying22–2420%20%
PsyduckWater30–3240%–
SlowpokeWaterPsychic30–32–40%
SeelWater30–3220%20%
GolbatPoisonFlying26–3010%10%
GolduckWater32–3410%–
SlowbroWaterPsychic32–34–10%

B3 F

Walking in the cave encounter rate 7
PokémonTypeLv.FireRedLeafGreen
SeelWater30–3240%40%
ZubatPoisonFlying2410%10%
GolbatPoisonFlying26–3010%10%
PsyduckWater30–3220%–
SlowpokeWaterPsychic30–32–20%
GolduckWater32–3415%–
SlowbroWaterPsychic32–34–15%
DewgongWaterIce32–345%5%
Surfing encounter rate 2
PokémonTypeLv.FireRedLeafGreen
SeelWater25–3560%60%
KrabbyWater25–30–30%
HorseaWater25–3030%–
DewgongWaterIce35–405%5%
PsyduckWater30–404%–
SlowpokeWaterPsychic30–40–4%
GolduckWater35–401%–
SlowbroWaterPsychic35–40–1%
Fishing
RodPokémonLv.FireRedLeafGreen
Old RodMagikarp5100%100%
Good RodKrabby5–1520%60%
Horsea5–1560%20%
Magikarp5–1520%20%
Super RodKrabby15–30–80%
Horsea15–3080%–
Gyarados15–3516%16%
Psyduck15–254%–
Slowpoke15–25–4%

B4 F

Walking in the cave encounter rate 7
PokémonTypeLv.FireRedLeafGreen
SeelWater30–3450%50%
GolbatPoisonFlying26–3015%15%
DewgongWaterIce34–3610%10%
GolduckWater32–3415%–
SlowbroWaterPsychic32–34–15%
PsyduckWater3210%–
SlowpokeWaterPsychic32–10%
Surfing encounter rate 2
PokémonTypeLv.FireRedLeafGreen
SeelWater25–3560%60%
KrabbyWater25–30–30%
HorseaWater25–3030%–
DewgongWaterIce35–405%5%
PsyduckWater30–404%–
SlowpokeWaterPsychic30–40–4%
GolduckWater35–401%–
SlowbroWaterPsychic35–40–1%
Fishing
RodPokémonLv.FireRedLeafGreen
Old RodMagikarp5100%100%
Good RodKrabby5–1520%60%
Horsea5–1560%20%
Magikarp5–1520%20%
Super RodKrabby15–30–80%
Horsea15–3080%–
Gyarados15–3516%16%
Psyduck15–254%–
Slowpoke15–25–4%

Chances are the game’s encounter slots for each version (grass 20/20/10/10/10/10/5/5/4/4/1/1, surfing and Rock Smash 60/30/5/4/1, Old Rod 70/30, Good Rod 60/20/20, Super Rod 40/40/15/4/1). A dash means the Pokémon does not appear in that version here. Version exclusives · Where to find every Pokémon.

Items

ItemHowWhere
Ice HealItem ball1F
Water StoneItem ballB1 F
ReviveItem ballB1 F
Big PearlItem ballB2 F
NuggetHiddenB3 F
Ultra BallItem ballB4 F
Water StoneHiddenB4 F

Hidden items sparkle with the Itemfinder.

Tips

  • Articuno is a static level 50 encounter on B4F; it is Ice and Flying, so Rock and Electric attacks are super effective, and Sleep or Paralysis make the catch easier.
  • The fast currents in the water on the lower floors push you back unless you stop them with Strength: push the boulders into the holes so they drop into the current below.
  • Water Stones are available in two places (an item ball on B1F and a hidden one on B4F), which is great for Starmie, Cloyster or Vaporeon.
  • Version differences: FireRed has Psyduck and Golduck, while LeafGreen has Slowpoke and Slowbro; when you Surf or use the Super Rod on the lower floors FireRed gives Horsea and LeafGreen gives Krabby (the Good Rod finds both in either version), and surfing gives Seel and Dewgong in both.
  • Super Rod fishing on B3F and B4F can bring up a Gyarados, and you will also find a Big Pearl on B2F and a hidden Nugget on B3F.

Walkthrough: Part 11: Cinnabar Island and Blaine

More maps

Seafoam Islands: Seafoam Islands B4F
Seafoam Islands B4F
Seafoam Islands: Seafoam Islands B3F
Seafoam Islands B3F
Seafoam Islands: Seafoam Islands B2F
Seafoam Islands B2F
Seafoam Islands: Seafoam Islands B1F
Seafoam Islands B1F

FAQ

Where is Articuno in FireRed and LeafGreen?

On B4F of the Seafoam Islands, as a level 50 static encounter.

Do I need Strength in Seafoam Islands?

Yes, to push the boulders into the holes so they block the strong currents, and Surf is needed to cross the water.

Which Pokémon differ between FireRed and LeafGreen in Seafoam Islands?

FireRed has Psyduck and Golduck, while LeafGreen has Slowpoke and Slowbro; surfing and the Super Rod also give Horsea in FireRed and Krabby in LeafGreen, though the Good Rod finds both in either version.

What Pokémon can you catch in Seafoam Islands in FireRed and LeafGreen?

12 species: Zubat, Psyduck, Slowpoke, Golbat, Seel, Golduck, Slowbro, Dewgong, Krabby, Horsea, Magikarp, Gyarados. FireRed only: Psyduck, Golduck, Horsea. LeafGreen only: Slowpoke, Slowbro, Krabby.

Sources & picture credits

Guide text is original retrogameindex writing, checked against Bulbapedia and the game data. Wild Pokémon and encounter chances for both versions, items, trainers, gifts, trades and shops come from the pret/pokefirered decompilation (pret/pokefirered 037335f4c7). Maps and sprites © Nintendo / Creatures / GAME FREAK, archived from the Bulbagarden Archives; the region maps are drawn from the game’s own map graphics (listed on the image gallery).