Pokedex Randomizer

Phase 7 section

Pokemon Yellow Seafoam Islands and Cinnabar Route Walkthrough

Seafoam Islands and Cinnabar Route section for the Pokemon Yellow walkthrough with wild Pokemon, trainers, items, hidden items, coordinates, and boss strategy.

By Damodar Sharma Updated June 23, 2026 Walkthrough

Surf through the south sea route, solve Seafoam's boulder-current puzzle, and optionally catch Articuno. This page is a standalone section for Phase 7: Volcano Badge, with source-backed Yellow encounter, trainer, item, hidden item, and boss data.

Source maps

Route 19, Summer Beach House, Route 20, Seafoam Islands 1F, Seafoam Islands B1F, Seafoam Islands B2F, Seafoam Islands B3F, and Seafoam Islands B4F, and 1 more map files.

Wild rows71 Trainers20 Items4

Route plan

You can also Surf south from Pallet via Route 21, but Seafoam is core completion content and has Articuno. Route 19 also has the Summer Beach House for the Surfing Pikachu minigame.

Wild Pokemon

Each area below has its own table, split into encounter method bands: tall grass / cave floor, Surfing, the three rods, then gift, trade, prize, and static rows. Grass and Surf rows merge every Gen I wild slot for a species and show the combined odds out of 256 (slot rates 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256). Generation I has no time-of-day split, so no rate varies with the clock; a — note means the row needs nothing beyond reaching the area.

Route 19

Route 19 wild Pokemon by encounter method, levels, rate, and requirements
PokémonLevelsRateNotes
Surfing
Tentacool Yellow sprite Tentacool 5-40100%—
Fishing — Old Rod
Magikarp Yellow sprite Magikarp 5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Yellow sprite Goldeen 1050%Any fishable water tile after getting Good Rod.
Poliwag Yellow sprite Poliwag 1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Tentacool Yellow sprite Tentacool 1525%Yellow Super Rod slot table.
Staryu Yellow sprite Staryu 2025%Yellow Super Rod slot table.
Tentacool Yellow sprite Tentacool 3025%Yellow Super Rod slot table.
Tentacruel Yellow sprite Tentacruel 3025%Yellow Super Rod slot table.

Route 20

Route 20 wild Pokemon by encounter method, levels, rate, and requirements
PokémonLevelsRateNotes
Surfing
Tentacool Yellow sprite Tentacool 5-40100%—
Fishing — Old Rod
Magikarp Yellow sprite Magikarp 5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Yellow sprite Goldeen 1050%Any fishable water tile after getting Good Rod.
Poliwag Yellow sprite Poliwag 1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Tentacool Yellow sprite Tentacool 2025%Yellow Super Rod slot table.
Tentacruel Yellow sprite Tentacruel 2025%Yellow Super Rod slot table.
Staryu Yellow sprite Staryu 3025%Yellow Super Rod slot table.
Tentacruel Yellow sprite Tentacruel 4025%Yellow Super Rod slot table.

Seafoam Islands 1F

Seafoam Islands 1F wild Pokemon by encounter method, levels, rate, and requirements
PokémonLevelsRateNotes
Tall grass / cave floor
Zubat Yellow sprite Zubat 9-3645%—
Krabby Yellow sprite Krabby 25-2735%—
Slowpoke Yellow sprite Slowpoke 28-3015%—
Golbat Yellow sprite Golbat 27-365.5%—

Seafoam Islands B1F

Seafoam Islands B1F wild Pokemon by encounter method, levels, rate, and requirements
PokémonLevelsRateNotes
Tall grass / cave floor
Zubat Yellow sprite Zubat 18-3640%—
Krabby Yellow sprite Krabby 26-2830%—
Golbat Yellow sprite Golbat 279.8%—
Slowpoke Yellow sprite Slowpoke 299.8%—
Seel Yellow sprite Seel 22-265.5%—
Kingler Yellow sprite Kingler 285.1%—

Seafoam Islands B2F

Seafoam Islands B2F wild Pokemon by encounter method, levels, rate, and requirements
PokémonLevelsRateNotes
Tall grass / cave floor
Zubat Yellow sprite Zubat 27-3635%—
Krabby Yellow sprite Krabby 27-2925%—
Golbat Yellow sprite Golbat 27-3615%—
Kingler Yellow sprite Kingler 289.8%—
Seel Yellow sprite Seel 249.8%—
Slowpoke Yellow sprite Slowpoke 314.3%—
Slowbro Yellow sprite Slowbro 311.2%—

Seafoam Islands B3F

Seafoam Islands B3F wild Pokemon by encounter method, levels, rate, and requirements
PokémonLevelsRateNotes
Tall grass / cave floor
Zubat Yellow sprite Zubat 27-3630%—
Krabby Yellow sprite Krabby 29-3120%—
Golbat Yellow sprite Golbat 2720%—
Seel Yellow sprite Seel 26-3015%—
Kingler Yellow sprite Kingler 309.8%—
Dewgong Yellow sprite Dewgong 28-325.5%—
Surfing
Tentacool Yellow sprite Tentacool 20-4070%—
Staryu Yellow sprite Staryu 3030%—
Fishing — Old Rod
Magikarp Yellow sprite Magikarp 5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Yellow sprite Goldeen 1050%Any fishable water tile after getting Good Rod.
Poliwag Yellow sprite Poliwag 1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Krabby Yellow sprite Krabby 2525%Yellow Super Rod slot table.
Staryu Yellow sprite Staryu 2025%Yellow Super Rod slot table.
Kingler Yellow sprite Kingler 3525%Yellow Super Rod slot table.
Staryu Yellow sprite Staryu 4025%Yellow Super Rod slot table.

Seafoam Islands B4F

Seafoam Islands B4F wild Pokemon by encounter method, levels, rate, and requirements
PokémonLevelsRateNotes
Tall grass / cave floor
Golbat Yellow sprite Golbat 27-3625%—
Zubat Yellow sprite Zubat 36-4525%—
Seel Yellow sprite Seel 28-3220%—
Krabby Yellow sprite Krabby 3015%—
Kingler Yellow sprite Kingler 329.8%—
Dewgong Yellow sprite Dewgong 30-345.5%—
Surfing
Tentacool Yellow sprite Tentacool 20-4070%—
Staryu Yellow sprite Staryu 3030%—
Fishing — Old Rod
Magikarp Yellow sprite Magikarp 5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Yellow sprite Goldeen 1050%Any fishable water tile after getting Good Rod.
Poliwag Yellow sprite Poliwag 1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Krabby Yellow sprite Krabby 2525%Yellow Super Rod slot table.
Staryu Yellow sprite Staryu 2025%Yellow Super Rod slot table.
Kingler Yellow sprite Kingler 3525%Yellow Super Rod slot table.
Staryu Yellow sprite Staryu 4025%Yellow Super Rod slot table.
Static Pokemon
Articuno Yellow sprite Articuno 50StaticInteract with the overworld Pokemon.

Cinnabar Island

Cinnabar Island wild Pokemon by encounter method, levels, rate, and requirements
PokémonLevelsRateNotes
Fishing — Old Rod
Magikarp Yellow sprite Magikarp 5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Yellow sprite Goldeen 1050%Any fishable water tile after getting Good Rod.
Poliwag Yellow sprite Poliwag 1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Staryu Yellow sprite Staryu 1525%Yellow Super Rod slot table.
Tentacool Yellow sprite Tentacool 1525%Yellow Super Rod slot table.
Staryu Yellow sprite Staryu 1025%Yellow Super Rod slot table.
Tentacool Yellow sprite Tentacool 3025%Yellow Super Rod slot table.

Trainers

Route order Trainer Team Reward Optional / rematch note
1. Route 19 (9, 7)Swimmer trainer spriteSwimmerParty #2
Tentacool Yellow sprite Tentacool Lv. 30 Shellder Yellow sprite Shellder Lv. 30
$150One-time trainer; no rematch in Yellow.
2. Route 19 (12, 9)Swimmer trainer spriteSwimmerParty #3
Goldeen Yellow sprite Goldeen Lv. 29 Horsea Yellow sprite Horsea Lv. 29 Staryu Yellow sprite Staryu Lv. 29
$145One-time trainer; no rematch in Yellow.
3. Route 19 (13, 25)Swimmer trainer spriteSwimmerParty #4
Poliwag Yellow sprite Poliwag Lv. 30 Poliwhirl Yellow sprite Poliwhirl Lv. 30
$150One-time trainer; no rematch in Yellow.
4. Route 19 (4, 27)Swimmer trainer spriteSwimmerParty #5
Horsea Yellow sprite Horsea Lv. 27 Tentacool Yellow sprite Tentacool Lv. 27 Tentacool Yellow sprite Tentacool Lv. 27 Goldeen Yellow sprite Goldeen Lv. 27
$135One-time trainer; no rematch in Yellow.
5. Route 19 (16, 31)Swimmer trainer spriteSwimmerParty #6
Goldeen Yellow sprite Goldeen Lv. 29 Shellder Yellow sprite Shellder Lv. 29 Seaking Yellow sprite Seaking Lv. 29
$145One-time trainer; no rematch in Yellow.
6. Route 19 (9, 13)Swimmer trainer spriteSwimmerParty #7
Horsea Yellow sprite Horsea Lv. 30 Horsea Yellow sprite Horsea Lv. 30
$150One-time trainer; no rematch in Yellow.
7. Route 19 (8, 43)Beauty trainer spriteBeautyParty #12
Poliwag Yellow sprite Poliwag Lv. 27 Goldeen Yellow sprite Goldeen Lv. 27 Seaking Yellow sprite Seaking Lv. 27 Goldeen Yellow sprite Goldeen Lv. 27 Poliwag Yellow sprite Poliwag Lv. 27
$1,890One-time trainer; no rematch in Yellow.
8. Route 19 (11, 43)Beauty trainer spriteBeautyParty #13
Goldeen Yellow sprite Goldeen Lv. 30 Seaking Yellow sprite Seaking Lv. 30
$2,100One-time trainer; no rematch in Yellow.
9. Route 19 (9, 42)Swimmer trainer spriteSwimmerParty #8
Tentacool Yellow sprite Tentacool Lv. 27 Tentacool Yellow sprite Tentacool Lv. 27 Staryu Yellow sprite Staryu Lv. 27 Horsea Yellow sprite Horsea Lv. 27 Tentacruel Yellow sprite Tentacruel Lv. 27
$135One-time trainer; no rematch in Yellow.
10. Route 19 (10, 44)Beauty trainer spriteBeautyParty #14
Staryu Yellow sprite Staryu Lv. 29 Staryu Yellow sprite Staryu Lv. 29 Staryu Yellow sprite Staryu Lv. 29
$2,030One-time trainer; no rematch in Yellow.
11. Route 20 (87, 8)Swimmer trainer spriteSwimmerParty #9
Shellder Yellow sprite Shellder Lv. 31 Cloyster Yellow sprite Cloyster Lv. 31
$155One-time trainer; no rematch in Yellow.
12. Route 20 (68, 11)Beauty trainer spriteBeautyParty #15
Seadra Yellow sprite Seadra Lv. 30 Horsea Yellow sprite Horsea Lv. 30 Seadra Yellow sprite Seadra Lv. 30
$2,100One-time trainer; no rematch in Yellow.
13. Route 20 (45, 10)Beauty trainer spriteBeautyParty #6
Seaking Yellow sprite Seaking Lv. 35
$2,450One-time trainer; no rematch in Yellow.
14. Route 20 (55, 14)Jr. Trainer F trainer spriteJr. Trainer FParty #24
Tentacool Yellow sprite Tentacool Lv. 30 Horsea Yellow sprite Horsea Lv. 30 Seel Yellow sprite Seel Lv. 30
$600One-time trainer; no rematch in Yellow.
15. Route 20 (38, 13)Swimmer trainer spriteSwimmerParty #10
Staryu Yellow sprite Staryu Lv. 35
$175One-time trainer; no rematch in Yellow.
16. Route 20 (87, 13)Swimmer trainer spriteSwimmerParty #11
Horsea Yellow sprite Horsea Lv. 28 Horsea Yellow sprite Horsea Lv. 28 Seadra Yellow sprite Seadra Lv. 28 Horsea Yellow sprite Horsea Lv. 28
$140One-time trainer; no rematch in Yellow.
17. Route 20 (34, 9)Bird Keeper trainer spriteBird KeeperParty #11
Fearow Yellow sprite Fearow Lv. 30 Fearow Yellow sprite Fearow Lv. 30 Pidgeotto Yellow sprite Pidgeotto Lv. 30
$750One-time trainer; no rematch in Yellow.
18. Route 20 (25, 7)Beauty trainer spriteBeautyParty #7
Shellder Yellow sprite Shellder Lv. 30 Shellder Yellow sprite Shellder Lv. 30 Cloyster Yellow sprite Cloyster Lv. 30
$2,100One-time trainer; no rematch in Yellow.
19. Route 20 (24, 12)Jr. Trainer F trainer spriteJr. Trainer FParty #16
Goldeen Yellow sprite Goldeen Lv. 31 Seaking Yellow sprite Seaking Lv. 31
$620One-time trainer; no rematch in Yellow.
20. Route 20 (15, 8)Beauty trainer spriteBeautyParty #8
Poliwag Yellow sprite Poliwag Lv. 31 Seaking Yellow sprite Seaking Lv. 31
$2,170One-time trainer; no rematch in Yellow.

Items And Hidden Items

Item Type Area / direction Coordinate Requirement
NuggetHidden itemHidden on the searchable tile at (15, 15) in Seafoam Islands B2F.(15, 15)Press A on the hidden tile or use the Itemfinder nearby.
Max ElixerHidden itemHidden on the searchable tile at (9, 16) in Seafoam Islands B3F.(9, 16)Press A on the hidden tile or use the Itemfinder nearby.
Ultra BallHidden itemHidden on the searchable tile at (25, 17) in Seafoam Islands B4F.(25, 17)Press A on the hidden tile or use the Itemfinder nearby.
Pikachu's BeachOptional minigameInside Route 19's Summer Beach House.-Starter Pikachu must know Surf on original hardware; pret/pokeyellow also marks the Virtual Console bypass hook.

Boss Strategy

No boss or Rival branch is attached to this section.

Completion Checklist

  • Check the Summer Beach House if your starter Pikachu can Surf.
  • Push boulders to control currents.
  • Catch Articuno if desired.
  • Reach Cinnabar Island.
  • Verify the Yellow encounter rows before leaving if you are filling the Pokedex.
  • Use the item rows as a visible-item and hidden-item sweep before moving to the next section.

Sources

  • pret/pokeyellow: wild encounters, trainer parties, trainer money, map object events, hidden event items, rods, trades, and prize Pokemon.
  • Encounter odds aggregate the Gen I ten-slot rates: 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256.
  • Yellow is a single-game guide with no day/night encounter split; each area table groups species under method bands with Levels, Rate, and Notes columns.

Related articles

Pokemon Yellow Walkthrough HubPhase 7: Volcano BadgePrevious: Routes 16-18 and Cycling RoadNext: Cinnabar Island and Pokemon Mansion