Johto field journalPokémon HeartGold / SoulSilverGUIDES

Seafoam Islands HGSS · Kanto Area

Seafoam Islands in Pokémon HeartGold and SoulSilver
Seafoam Islands B4F (HeartGold and SoulSilver)

The Seafoam Islands are a pair of icy islands on Route 20 between Fuchsia City and Cinnabar Island. After the volcano on Cinnabar erupted, Blaine moved his Gym into a cave here, so this is where you earn the Volcano Badge in HGSS. The cave’s lower floors are a boulder-and-current puzzle that leads to Articuno on B4F.

Region
Kanto
Wild Pokémon
14
Items
15
Trainers
10
HMs
Surf, Strength
Gym
Blaine · Fire

Connects to: Route 20

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

Blaine’s Gym Kanto badge 7 of 8

Gym trainers

TrainerPokémonPrize
Super NerdCaryTorkoalTorkoal 53₽2,544
Super NerdWaldoNumelNumel 53₽2,544
Super NerdMerleMagcargoMagcargo 53₽2,544
ScientistLowellArcanineArcanine 50₽1,600
ScientistLindenMagmarMagmar 50₽1,600
ScientistDanielNinetalesNinetales 50₽1,600

Gift, legendary and roaming Pokémon

Articuno Lv. 50 · One-off encounter · B4F

On B4F, the lowest floor of the Seafoam Islands; you need Surf and Strength (push boulders into the water to stop the currents).

Wild Pokémon

1F

Walking in the cave encounter rate 5
PokémonTypeLv.MorningDayNight
ZubatPoisonFlying26–2830%30%30%
GolbatPoisonFlying30–3230%30%30%
PsyduckWater26–2930%30%30%
GolduckWater3210%10%10%
Hoenn SoundMakuhita 20%, Lv. 30–32 Absol 20%, Lv. 28–29Play the Hoenn Sound radio channel (after the National Pokédex): replaces four 10% grass slots.
Sinnoh SoundChingling 20%, Lv. 30–32 Bronzor 20%, Lv. 28–29Play the Sinnoh Sound radio channel (after the National Pokédex): replaces four 10% grass slots.

B1F

Walking in the cave encounter rate 5
PokémonTypeLv.MorningDayNight
GolbatPoisonFlying32–3430%30%30%
SeelWater32–3430%30%30%
PsyduckWater26–2816%16%16%
GolduckWater32–3414%14%14%
ZubatPoisonFlying28–2910%10%10%
Hoenn SoundMakuhita 20%, Lv. 32–34 Absol 20%, Lv. 28–34Play the Hoenn Sound radio channel (after the National Pokédex): replaces four 10% grass slots.
Sinnoh SoundChingling 20%, Lv. 32–34 Bronzor 20%, Lv. 28–34Play the Sinnoh Sound radio channel (after the National Pokédex): replaces four 10% grass slots.

B2F

Walking in the cave encounter rate 5
PokémonTypeLv.MorningDayNight
GolbatPoisonFlying33–3530%30%30%
SeelWater33–3530%30%30%
PsyduckWater27–3016%16%16%
GolduckWater33–3514%14%14%
ZubatPoisonFlying29–3010%10%10%
Hoenn SoundMakuhita 20%, Lv. 33–35 Absol 20%, Lv. 30–35Play the Hoenn Sound radio channel (after the National Pokédex): replaces four 10% grass slots.
Sinnoh SoundChingling 20%, Lv. 33–35 Bronzor 20%, Lv. 30–35Play the Sinnoh Sound radio channel (after the National Pokédex): replaces four 10% grass slots.

B3F

Walking in the cave encounter rate 10
PokémonTypeLv.MorningDayNight
GolbatPoisonFlying34–3630%30%30%
DewgongWaterIce35–3624%24%24%
GolduckWater34–3614%14%14%
PsyduckWater31–3212%12%12%
ZubatPoisonFlying31–3210%10%10%
SeelWater3410%10%10%
Hoenn SoundMakuhita 20%, Lv. 34–36 Absol 20%, Lv. 32–34Play the Hoenn Sound radio channel (after the National Pokédex): replaces four 10% grass slots.
Sinnoh SoundChingling 20%, Lv. 34–36 Bronzor 20%, Lv. 32–34Play the Sinnoh Sound radio channel (after the National Pokédex): replaces four 10% grass slots.

B4F

Walking in the cave encounter rate 10
PokémonTypeLv.MorningDayNight
GolbatPoisonFlying38–4030%30%30%
DewgongWaterIce37–3824%24%24%
GolduckWater37–3814%14%14%
JynxIcePsychic38–4012%12%12%
PsyduckWater3410%10%10%
SeelWater3410%10%10%
Hoenn SoundMakuhita 20%, Lv. 38 Absol 20%, Lv. 34Play the Hoenn Sound radio channel (after the National Pokédex): replaces four 10% grass slots.
Sinnoh SoundChingling 20%, Lv. 38 Bronzor 20%, Lv. 34Play the Sinnoh Sound radio channel (after the National Pokédex): replaces four 10% grass slots.
Surfing encounter rate 5
PokémonTypeLv.Chance
SeelWater30–4060%
HorseaWater30–4030%
SlowbroWaterPsychic35–5010%
Fishing
RodPokémonLv.Chance
Old RodMagikarp1085%
Krabby1015%
Good RodMagikarp2040%
Psyduck2030%
Krabby2020%
Horsea2010%
Super RodGyarados4040%
Horsea4030%
Kingler4015%
Seadra4015%

Chances are the game’s encounter slots: grass and caves 20/20/10/10/10/10/5/5/4/4/1/1, with every slot changing by time of day (morning 4:00–9:59, day 10:00–19:59, night 20:00–3:59); surfing 60/30/5/4/1; all three rods 40/30/15/10/5; Rock Smash 80/20; Headbutt 50/15/15/10/5/5. HG and SS mark Pokémon found in only one version. Where to find every Pokémon.

Trainers

TrainerPokémonPrize
BoarderBryceDewgongDewgong 55LaprasLapras 50₽1,600
BoarderShaunCloysterCloyster 55DewgongDewgong 50₽1,600
SkierCadyDelibirdDelibird 53₽1,696

Prize money is four times the level of the trainer’s last Pokémon times the trainer class’s rate (doubled in double battles). Trainers who give you their Pokégear number call when they want a rematch, with stronger teams as you progress.

Items

ItemHowWhere
Escape RopeHidden1F
Grip ClawItem ballB1F
Ice HealItem ballB1F
Ice HealHiddenB1F
Water StoneItem ballB2F
PearlHiddenB2F
PearlHiddenB2F
ReviveItem ballB3F
Big PearlItem ballB3F
Max ReviveHiddenB3F
Rare CandyHiddenB3F
Ultra BallItem ballB4F
TM13 Ice BeamItem ballB4F
ZincHiddenB4F
TM50 OverheatGiftCinnabar Gym

Hidden items can be found with the Dowsing MCHN Pokégear app.

Tips

  • Blaine’s Gym is inside the islands; his team is Magcargo Lv54, Magmar Lv54 and Rapidash Lv59.
  • Water and Ground moves handle Blaine’s team, and beating him earns the Volcano Badge and TM50 Overheat.
  • Use Strength to push boulders into the water and block the currents, which lets you Surf through to the lower floors.
  • Articuno waits on B4F at Lv50, with a Zinc hidden underneath it.
  • TM13 Ice Beam is in the northeast corner of B4F.
  • Jynx appears on B4F at 12%, Dewgong on B3F and B4F, and Surfing on B4F can bring Slowbro.
  • Boarders and a Skier on B2F use Ice types up to Lv55.

Walkthrough: Part 21: Mt. Moon, Cinnabar Island and Blaine · Part 24: Legendary Pokémon and Kanto Loose Ends

More pictures

Seafoam Islands: Seafoam Islands B3F (HeartGold and SoulSilver)
Seafoam Islands B3F (HeartGold and SoulSilver)
Seafoam Islands: Seafoam Islands B1F (HeartGold and SoulSilver)
Seafoam Islands B1F (HeartGold and SoulSilver)
Seafoam Islands: Seafoam Islands entrance picture (day, from the game)
Seafoam Islands entrance picture (day, from the game)
Seafoam Islands: Seafoam Islands entrance picture (night, from the game)
Seafoam Islands entrance picture (night, from the game)

FAQ

Where is Blaine’s Gym in HeartGold and SoulSilver?

In the Seafoam Islands on Route 20, since the volcano destroyed the old Gym on Cinnabar Island.

How do you get to Articuno in HGSS?

Surf to the Seafoam Islands and use Strength to push boulders into the water, stopping the currents; Articuno is on B4F at Lv50.

Where is TM13 Ice Beam in HeartGold and SoulSilver?

On B4F of the Seafoam Islands, in the northeast corner.

Where can you catch Jynx in HGSS?

On B4F of the Seafoam Islands, at a 12% rate.

What Pokémon can you catch in Seafoam Islands in HeartGold and SoulSilver?

14 species: Zubat, Golbat, Psyduck, Golduck, Seel, Dewgong, Jynx, Horsea, Slowbro, Magikarp, Krabby, Gyarados, Kingler, Seadra.

Sources & picture credits

Guide text is original retrogameindex writing, checked against Bulbapedia and the game data. Wild Pokémon and encounter chances, items, trainers, rematch teams, gifts and shops come from the pret/pokeheartgold decompilation, and the Pokémon sprites and dungeon entrance pictures are drawn from the game’s own graphics in it. The position maps are the Gold/Silver wiki’s Pokégear map renders. Location pictures and trainer sprites © Nintendo / Creatures / GAME FREAK, archived from the Pokémon Wiki on Fandom (listed on the image gallery).