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Pokemon Red and Blue Cerulean Cave Completion Walkthrough

Cerulean Cave Completion section for the Pokemon Red and Blue walkthrough with wild Pokemon, trainers, items, hidden items, coordinates, and boss strategy.

By Damodar Sharma Updated June 19, 2026 Walkthrough

Enter Cerulean Cave after becoming Champion, collect its rare encounters and items, and catch Mewtwo. This page is a standalone section for Phase 10: Post-Game + Completion, with source-backed Red/Blue encounter, trainer, item, hidden item, and boss data.

Source maps

Cerulean Cave 1F, Cerulean Cave 2F, and Cerulean Cave B1F.

Wild rows52 Trainers0 Items10

Route plan

Cerulean Cave has the highest wild levels in Red/Blue. Bring Surf, strong balls, status, and an escape plan.

Wild Pokemon

Version

Each area below has its own table, split by encounter method. Red/Blue has no time-of-day mechanic, so every method uses a single rate column, and the R/B chips show which version each row applies to. Tall grass, cave, and Surf rates merge every base slot for a species out of the Gen I ten-slot table: 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256. Fishing, gift, trade, prize, and static rows keep their own labeled rates.

Cerulean Cave 1F

Cerulean Cave 1F wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Tall grass / cave floor
Golbat Red and Blue sprite Golbat RB4620%—
Hypno Red and Blue sprite Hypno RB4620%—
Magneton Red and Blue sprite Magneton RB4615%—
Dodrio Red and Blue sprite Dodrio RB499.8%—
Venomoth Red and Blue sprite Venomoth RB499.8%—
Arbok Red and Blue sprite Arbok RB529.8%—
Sandslash Red and Blue sprite Sandslash RB529.8%—
Kadabra Red and Blue sprite Kadabra RB495.1%—
Parasect Red and Blue sprite Parasect RB525.1%—
Raichu Red and Blue sprite Raichu RB534.3%—
Ditto Red and Blue sprite Ditto RB531.2%—
Fishing — Old Rod
Magikarp Red and Blue sprite Magikarp RB5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Red and Blue sprite Goldeen RB1050%Any fishable water tile after getting Good Rod.
Poliwag Red and Blue sprite Poliwag RB1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Slowbro Red and Blue sprite Slowbro RB2325%Super Rod group 9.
Seaking Red and Blue sprite Seaking RB2325%Super Rod group 9.
Kingler Red and Blue sprite Kingler RB2325%Super Rod group 9.
Seadra Red and Blue sprite Seadra RB2325%Super Rod group 9.

Cerulean Cave 2F

Cerulean Cave 2F wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Tall grass / cave floor
Dodrio Red and Blue sprite Dodrio RB5120%—
Venomoth Red and Blue sprite Venomoth RB5120%—
Kadabra Red and Blue sprite Kadabra RB5115%—
Rhydon Red and Blue sprite Rhydon RB529.8%—
Marowak Red and Blue sprite Marowak RB529.8%—
Electrode Red and Blue sprite Electrode RB529.8%—
Ditto Red and Blue sprite Ditto RB55-605.5%—
Chansey Red and Blue sprite Chansey RB565.1%—
Wigglytuff Red and Blue sprite Wigglytuff RB545.1%—
Fishing — Old Rod
Magikarp Red and Blue sprite Magikarp RB5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Red and Blue sprite Goldeen RB1050%Any fishable water tile after getting Good Rod.
Poliwag Red and Blue sprite Poliwag RB1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Slowbro Red and Blue sprite Slowbro RB2325%Super Rod group 9.
Seaking Red and Blue sprite Seaking RB2325%Super Rod group 9.
Kingler Red and Blue sprite Kingler RB2325%Super Rod group 9.
Seadra Red and Blue sprite Seadra RB2325%Super Rod group 9.

Cerulean Cave B1F

Cerulean Cave B1F wild Pokémon by method, games, levels, encounter rate, and requirements
PokémonGamesLevelsRateNotes
Tall grass / cave floor
Rhydon Red and Blue sprite Rhydon RB5520%—
Marowak Red and Blue sprite Marowak RB5520%—
Electrode Red and Blue sprite Electrode RB5515%—
Ditto Red and Blue sprite Ditto RB63-6711%—
Chansey Red and Blue sprite Chansey RB649.8%—
Parasect Red and Blue sprite Parasect RB649.8%—
Raichu Red and Blue sprite Raichu RB649.8%—
Arbok Red and Blue sprite Arbok RB575.1%—
Sandslash Red and Blue sprite Sandslash RB575.1%—
Fishing — Old Rod
Magikarp Red and Blue sprite Magikarp RB5100%Any fishable water tile.
Fishing — Good Rod
Goldeen Red and Blue sprite Goldeen RB1050%Any fishable water tile after getting Good Rod.
Poliwag Red and Blue sprite Poliwag RB1050%Any fishable water tile after getting Good Rod.
Fishing — Super Rod
Slowbro Red and Blue sprite Slowbro RB2325%Super Rod group 9.
Seaking Red and Blue sprite Seaking RB2325%Super Rod group 9.
Kingler Red and Blue sprite Kingler RB2325%Super Rod group 9.
Seadra Red and Blue sprite Seadra RB2325%Super Rod group 9.
Static Pokemon
Mewtwo Red and Blue sprite Mewtwo RB70StaticInteract with the overworld Pokemon.
Static legendary
Mewtwo Red and Blue sprite Mewtwo RB70StaticEnter Cerulean Cave after becoming Champion and reach B1F.

Trainers

No regular trainers are sourced for this section.

Items And Hidden Items

Item Type Area / direction Coordinate Requirement
Full RestoreVisible item ballVisible item ball at (7, 13) in Cerulean Cave 1F.(7, 13)Reach this tile; HMs or story flags may be needed for late-game dungeons.
Max ElixerVisible item ballVisible item ball at (19, 3) in Cerulean Cave 1F.(19, 3)Reach this tile; HMs or story flags may be needed for late-game dungeons.
NuggetVisible item ballVisible item ball at (5, 0) in Cerulean Cave 1F.(5, 0)Reach this tile; HMs or story flags may be needed for late-game dungeons.
PP UpVisible item ballVisible item ball at (29, 9) in Cerulean Cave 2F.(29, 9)Reach this tile; HMs or story flags may be needed for late-game dungeons.
Ultra BallVisible item ballVisible item ball at (4, 15) in Cerulean Cave 2F.(4, 15)Reach this tile; HMs or story flags may be needed for late-game dungeons.
Full RestoreVisible item ballVisible item ball at (13, 6) in Cerulean Cave 2F.(13, 6)Reach this tile; HMs or story flags may be needed for late-game dungeons.
Ultra BallVisible item ballVisible item ball at (16, 9) in Cerulean Cave B1F.(16, 9)Reach this tile; HMs or story flags may be needed for late-game dungeons.
Max ReviveVisible item ballVisible item ball at (18, 1) in Cerulean Cave B1F.(18, 1)Reach this tile; HMs or story flags may be needed for late-game dungeons.
Rare CandyHidden itemHidden on the searchable tile at (14, 11) in Cerulean Cave 1F.(14, 11)Press A on the hidden tile or use the Itemfinder nearby.
Ultra BallHidden itemHidden on the searchable tile at (27, 3) in Cerulean Cave B1F.(27, 3)Press A on the hidden tile or use the Itemfinder nearby.

Boss Strategy

Boss / branch Team Reward Danger notes Practical counters
Champion Rival trainer spriteChampion RivalMewtwo capture prep
Mewtwo Red and Blue sprite Mewtwo Lv. 70
Static encounterMewtwo is level 70 with huge Special and Speed.Bring Ultra Balls, status, a sleep/paralysis user, and a Pokemon that can take Psychic without fainting instantly.

Completion Checklist

  • Collect every Cerulean Cave item.
  • Catch rare high-level wild Pokemon.
  • Capture Mewtwo.
  • Verify the wild table's version splits 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/pokered: 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.
  • Red/Blue has no day/night encounter column; tables group each area by encounter method with R/B game chips and a single merged Rate column.

Related articles

Pokemon Red and Blue Walkthrough HubPhase 10: Post-Game + CompletionPrevious: Indigo Plateau Elite Four and ChampionNext: Version, Trade, Fossil, and Prize Cleanup