Seafoam Islands

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Seafoam Islands

Access to:
Either exit: Route 20

Utility:
Surf is required to access the Seafoam Islands, as well as to navigate them. In Yellow, wild Pokémon can also be encountered by Surfing on B3F and B4F.
Strength is required to navigate the Seafoam Islands.

Pokémon

Walking

1F

Combined (Compressed)
Pokémon		Red	Green	Blue	Yellow
	Seel	20% 30	20% 30	20% 30	N/A
	Slowpoke	20% 30	5% 28	5% 28	15% 28, 30
	Shellder	19% 28, 30	N/A	N/A	N/A
	Horsea	20% 28, 30	N/A	20% 30	N/A
	Zubat	10% 21	10% 21	10% 21	45% 9, 18, 27, 36
	Golbat	5% 29	5% 29	5% 29	5% 27, 36
	Psyduck	5% 28	20% 30	N/A	N/A
	Golduck	1% 38	N/A	N/A	N/A
	Staryu	N/A	19% 28, 30	19% 28, 30	N/A
	Krabby	N/A	20% 28, 30	20% 28, 30	35% 25, 27
	Slowbro	N/A	1% 38	1% 38	N/A

B1F

Combined (Compressed)
Pokémon		Red	Green	Blue	Yellow
	Staryu	20% 30	15% 32	15% 32	N/A
	Horsea	30% 30, 32	N/A	15% 28, 30	N/A
	Shellder	15% 32	20% 30	20% 30	N/A
	Slowpoke	15% 28, 30	N/A	N/A	10% 29
	Seel	15% 28, 30	15% 28, 30	15% 28, 30	5% 22, 26
	Dewgong	4% 38	4% 38	4% 38	N/A
	Seadra	1% 37	N/A	N/A	N/A
	Krabby	N/A	30% 30, 32	30% 30, 32	30% 26, 28
	Psyduck	N/A	15% 28, 30	N/A	N/A
	Kingler	N/A	1% 37	1% 37	5% 28
	Zubat	N/A	N/A	N/A	40% 18, 27, 36
	Golbat	N/A	N/A	N/A	10% 27

B2F

Combined (Compressed)
Pokémon		Red	Green	Blue	Yellow
	Seel	35% 30, 32	35% 30, 32	35% 30, 32	10% 24
	Slowpoke	30% 30, 32	N/A	N/A	4% 31
	Horsea	15% 28, 30	N/A	30% 30, 32	N/A
	Staryu	10% 30	5% 28	5% 28	N/A
	Shellder	5% 28	10% 30	10% 30	N/A
	Golbat	4% 30	4% 30	4% 30	15% 27, 36
	Slowbro	1% 37	N/A	N/A	1% 31
	Psyduck	N/A	30% 30, 32	N/A	N/A
	Krabby	N/A	15% 28, 30	15% 28, 30	25% 27, 29
	Golduck	N/A	1% 37	N/A	N/A
	Jynx	N/A	N/A	1% 37	N/A
	Zubat	N/A	N/A	N/A	35% 27, 36
	Kingler	N/A	N/A	N/A	10% 28

B3F

Combined (Compressed)
Pokémon		Red	Green	Blue	Yellow
	Slowpoke	35% 31, 33	N/A	N/A	N/A
	Seel	30% 31, 33	30% 31, 33	30% 31, 33	15% 26, 30
	Horsea	15% 29, 31	N/A	35% 31, 33	N/A
	Shellder	15% 29, 31	N/A	N/A	N/A
	Seadra	4% 39	N/A	N/A	N/A
	Dewgong	1% 37	1% 37	1% 37	5% 28, 32
	Psyduck	N/A	35% 31, 33	N/A	N/A
	Krabby	N/A	15% 29, 31	15% 29, 31	20% 29, 31
	Staryu	N/A	15% 29, 31	15% 29, 31	N/A
	Kingler	N/A	4% 39	4% 39	10% 30
	Golbat	N/A	N/A	N/A	20% 27
	Zubat	N/A	N/A	N/A	30% 27, 36

B4F

Combined (Compressed)
Pokémon		Red	Green	Blue	Yellow
	Horsea	35% 31, 33	N/A	15% 29, 31	N/A
	Shellder	30% 31, 33	N/A	N/A	N/A
	Slowpoke	15% 29, 31	N/A	N/A	N/A
	Seel	15% 29, 31	15% 29, 31	15% 29, 31	20% 28, 32
	Slowbro	4% 39	N/A	N/A	N/A
	Golbat	1% 32	1% 32	1% 32	25% 27, 36
	Krabby	N/A	35% 31, 33	35% 31, 33	15% 30
	Staryu	N/A	30% 31, 33	30% 31, 33	N/A
	Psyduck	N/A	15% 29, 31	N/A	N/A
	Golduck	N/A	4% 39	N/A	N/A
	Jynx	N/A	N/A	4% 39	N/A
	Zubat	N/A	N/A	N/A	25% 36, 45
	Kingler	N/A	N/A	N/A	10% 32
	Dewgong	N/A	N/A	N/A	5% 30, 34

Surfing (B3F and B4F)

Yellow (Full)
Pokémon		Level	Rate
	Tentacool	25	20%
	Tentacool	30	20%
	Tentacool	20	15%
	Staryu	30	10%
	Tentacool	35	10%
	Staryu	30	10%
	Tentacool	40	5%
	Staryu	30	5%
	Staryu	30	4%
	Staryu	30	1%

No Pokémon can be found here with Surf in Red, Green, or Blue.

Combined (Full)
Rate	Yellow
20%		Tentacool	25
20%		Tentacool	30
15%		Tentacool	20
10%		Staryu	30
10%		Tentacool	35
10%		Staryu	30
5%		Tentacool	40
5%		Staryu	30
4%		Staryu	30
1%		Staryu	30

No Pokémon can be found here with Surf in Red, Green, or Blue.

Combined (Compressed)
Pokémon		Yellow
	Tentacool	70% 20, 25, 30, 35, 40
	Staryu	30% 30

Fishing (B3F and B4F)

Red (Full)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Staryu	Super	15	25%
	Horsea	Super	15	25%
	Shellder	Super	15	25%
	Goldeen	Super	15	25%

Green (Full)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Staryu	Super	15	25%
	Horsea	Super	15	25%
	Shellder	Super	15	25%
	Goldeen	Super	15	25%

Blue (Full)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Staryu	Super	15	25%
	Horsea	Super	15	25%
	Shellder	Super	15	25%
	Goldeen	Super	15	25%

Yellow (Full)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Krabby	Super	25	40%
	Staryu	Super	20	30%
	Kingler	Super	35	20%
	Staryu	Super	40	10%

Combined (Full)
Rate	Rod	Red			Green			Blue			Yellow
100%	Old		Magikarp	5		Magikarp	5		Magikarp	5		Magikarp	5
50%	Good		Goldeen	10		Goldeen	10		Goldeen	10		Goldeen	10
50%	Good		Poliwag	10		Poliwag	10		Poliwag	10		Poliwag	10
25%	Super		Staryu	15		Staryu	15		Staryu	15	N/A
25%	Super		Horsea	15		Horsea	15		Horsea	15	N/A
25%	Super		Shellder	15		Shellder	15		Shellder	15	N/A
25%	Super		Goldeen	15		Goldeen	15		Goldeen	15	N/A
40%	Super	N/A			N/A			N/A				Krabby	25
30%	Super	N/A			N/A			N/A				Staryu	20
20%	Super	N/A			N/A			N/A				Kingler	35
10%	Super	N/A			N/A			N/A				Staryu	40

Red (Compressed)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Staryu	Super	15	25%
	Horsea	Super	15	25%
	Shellder	Super	15	25%
	Goldeen	Super	15	25%

Green (Compressed)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Staryu	Super	15	25%
	Horsea	Super	15	25%
	Shellder	Super	15	25%
	Goldeen	Super	15	25%

Blue (Compressed)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Staryu	Super	15	25%
	Horsea	Super	15	25%
	Shellder	Super	15	25%
	Goldeen	Super	15	25%

Yellow (Compressed)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Krabby	Super	25	40%
	Staryu	Super	20, 40	40%
	Kingler	Super	35	20%

Combined (Compressed)
Pokémon		Rod	Red	Green	Blue	Yellow
	Magikarp	Old	100% 5	100% 5	100% 5	100% 5
	Goldeen	Good	50% 10	50% 10	50% 10	50% 10
	Poliwag	Good	50% 10	50% 10	50% 10	50% 10
	Staryu	Super	25% 15	25% 15	25% 15	40% 20, 40
	Horsea	Super	25% 15	25% 15	25% 15	N/A
	Shellder	Super	25% 15	25% 15	25% 15	N/A
	Goldeen	Super	25% 15	25% 15	25% 15	N/A
	Krabby	Super	N/A	N/A	N/A	40% 25
	Kingler	Super	N/A	N/A	N/A	20% 35

Static

B4F

All Versions
Pokémon		Level	Games				Notes
	Articuno	50	R	G	B	Y	If defeated, no other Articuno can be obtained on the save file unless it is restarted.

Pokémon

Walking

1F

Combined (Compressed)
Pokémon		Red	Blue	Yellow
	Seel	20% 30	20% 30	N/A
	Slowpoke	20% 30	5% 28	15% 28, 30
	Shellder	19% 28, 30	N/A	N/A
	Horsea	20% 28, 30	N/A	N/A
	Zubat	10% 21	10% 21	45% 9, 18, 27, 36
	Golbat	5% 29	5% 29	5% 27, 36
	Psyduck	5% 28	20% 30	N/A
	Golduck	1% 38	N/A	N/A
	Staryu	N/A	19% 28, 30	N/A
	Krabby	N/A	20% 28, 30	35% 25, 27
	Slowbro	N/A	1% 38	N/A

B1F

Combined (Compressed)
Pokémon		Red	Blue	Yellow
	Staryu	20% 30	15% 32	N/A
	Horsea	30% 30, 32	N/A	N/A
	Shellder	15% 32	20% 30	N/A
	Slowpoke	15% 28, 30	N/A	10% 29
	Seel	15% 28, 30	15% 28, 30	5% 22, 26
	Dewgong	4% 38	4% 38	N/A
	Seadra	1% 37	N/A	N/A
	Krabby	N/A	30% 30, 32	30% 26, 28
	Psyduck	N/A	15% 28, 30	N/A
	Kingler	N/A	1% 37	5% 28
	Zubat	N/A	N/A	40% 18, 27, 36
	Golbat	N/A	N/A	10% 27

B2F

Combined (Compressed)
Pokémon		Red	Blue	Yellow
	Seel	35% 30, 32	35% 30, 32	10% 24
	Slowpoke	30% 30, 32	N/A	4% 31
	Horsea	15% 28, 30	N/A	N/A
	Staryu	10% 30	5% 28	N/A
	Shellder	5% 28	10% 30	N/A
	Golbat	4% 30	4% 30	15% 27, 36
	Slowbro	1% 37	N/A	1% 31
	Psyduck	N/A	30% 30, 32	N/A
	Krabby	N/A	15% 28, 30	25% 27, 29
	Golduck	N/A	1% 37	N/A
	Zubat	N/A	N/A	35% 27, 36
	Kingler	N/A	N/A	10% 28

B3F

Combined (Compressed)
Pokémon		Red	Blue	Yellow
	Slowpoke	35% 31, 33	N/A	N/A
	Seel	30% 31, 33	30% 31, 33	15% 26, 30
	Horsea	15% 29, 31	N/A	N/A
	Shellder	15% 29, 31	N/A	N/A
	Seadra	4% 39	N/A	N/A
	Dewgong	1% 37	1% 37	5% 28, 32
	Psyduck	N/A	35% 31, 33	N/A
	Krabby	N/A	15% 29, 31	20% 29, 31
	Staryu	N/A	15% 29, 31	N/A
	Kingler	N/A	4% 39	10% 30
	Golbat	N/A	N/A	20% 27
	Zubat	N/A	N/A	30% 27, 36

B4F

Combined (Compressed)
Pokémon		Red	Blue	Yellow
	Horsea	35% 31, 33	N/A	N/A
	Shellder	30% 31, 33	N/A	N/A
	Slowpoke	15% 29, 31	N/A	N/A
	Seel	15% 29, 31	15% 29, 31	20% 28, 32
	Slowbro	4% 39	N/A	N/A
	Golbat	1% 32	1% 32	25% 27, 36
	Krabby	N/A	35% 31, 33	15% 30
	Staryu	N/A	30% 31, 33	N/A
	Psyduck	N/A	15% 29, 31	N/A
	Golduck	N/A	4% 39	N/A
	Zubat	N/A	N/A	25% 36, 45
	Kingler	N/A	N/A	10% 32
	Dewgong	N/A	N/A	5% 30, 34

Surfing (B3F and B4F)

Yellow (Full)
Pokémon		Level	Rate
	Tentacool	25	20%
	Tentacool	30	20%
	Tentacool	20	15%
	Staryu	30	10%
	Tentacool	35	10%
	Staryu	30	10%
	Tentacool	40	5%
	Staryu	30	5%
	Staryu	30	4%
	Staryu	30	1%

No Pokémon can be found here with Surf in Red or Blue.

Combined (Full)
Rate	Yellow
20%		Tentacool	25
20%		Tentacool	30
15%		Tentacool	20
10%		Staryu	30
10%		Tentacool	35
10%		Staryu	30
5%		Tentacool	40
5%		Staryu	30
4%		Staryu	30
1%		Staryu	30

No Pokémon can be found here with Surf in Red or Blue.

Combined (Compressed)
Pokémon		Yellow
	Tentacool	70% 20, 25, 30, 35, 40
	Staryu	30% 30

Fishing (B3F and B4F)

Red (Full)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Staryu	Super	15	25%
	Horsea	Super	15	25%
	Shellder	Super	15	25%
	Goldeen	Super	15	25%

Blue (Full)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Staryu	Super	15	25%
	Horsea	Super	15	25%
	Shellder	Super	15	25%
	Goldeen	Super	15	25%

Yellow (Full)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Krabby	Super	25	40%
	Staryu	Super	20	30%
	Kingler	Super	35	20%
	Staryu	Super	40	10%

Combined (Full)
Rate	Rod	Red			Blue			Yellow
100%	Old		Magikarp	5		Magikarp	5		Magikarp	5
50%	Good		Goldeen	10		Goldeen	10		Goldeen	10
50%	Good		Poliwag	10		Poliwag	10		Poliwag	10
25%	Super		Staryu	15		Staryu	15	N/A
25%	Super		Horsea	15		Horsea	15	N/A
25%	Super		Shellder	15		Shellder	15	N/A
25%	Super		Goldeen	15		Goldeen	15	N/A
40%	Super	N/A			N/A				Krabby	25
30%	Super	N/A			N/A				Staryu	20
20%	Super	N/A			N/A				Kingler	35
10%	Super	N/A			N/A				Staryu	40

Red (Compressed)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Staryu	Super	15	25%
	Horsea	Super	15	25%
	Shellder	Super	15	25%
	Goldeen	Super	15	25%

Blue (Compressed)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Staryu	Super	15	25%
	Horsea	Super	15	25%
	Shellder	Super	15	25%
	Goldeen	Super	15	25%

Yellow (Compressed)
Pokémon		Rod	Level	Rate
	Magikarp	Old	5	100%
	Goldeen	Good	10	50%
	Poliwag	Good	10	50%
	Krabby	Super	25	40%
	Staryu	Super	20, 40	40%
	Kingler	Super	35	20%

Combined (Compressed)
Pokémon		Rod	Red	Blue	Yellow
	Magikarp	Old	100% 5	100% 5	100% 5
	Goldeen	Good	50% 10	50% 10	50% 10
	Poliwag	Good	50% 10	50% 10	50% 10
	Staryu	Super	25% 15	25% 15	40% 20, 40
	Horsea	Super	25% 15	25% 15	N/A
	Shellder	Super	25% 15	25% 15	N/A
	Goldeen	Super	25% 15	25% 15	N/A
	Krabby	Super	N/A	N/A	40% 25
	Kingler	Super	N/A	N/A	20% 35

Static

B4F

All Versions
Pokémon		Level	Games			Notes
	Articuno	50	R	B	Y	If defeated, no other Articuno can be obtained on the save file unless it is restarted.

Items

RBY Items
Item	Games			Location	Notes
Nugget	R	B	Y	B2F, on a rock in the south of the floor	Hidden.
Max Elixer	R	B	Y	B3F, on a rock south of the eastern boulder	Hidden.
Ultra Ball	R	B	Y	B4F, on the easternmost rock in the southeast	Hidden.