Cerulean CaveFireRed&LeafGreen

"Post-game dungeon locked behind the Elite Four. Mewtwo is waiting at the bottom, and the wild Pokemon here are the highest-level encounters in Kanto."

21PokemonLv5-70Levels1Specials6Items

CERULEAN CAVE MAP

Three floors connected by ladders and water. B1F is mostly submerged and requires Surf to navigate. The layout gets more confusing the deeper you go.

Type Coverage
Water-Heavy AreaBring Electric or Grass type
WATER9PSYCHIC3ROCK2ELECTRIC2FIGHTING2BUG1
Only Found Here· 2
Nuzlocke Picks· 21

Pokemon Encounters

Mewtwo at level 70 is the deepest encounter. Ditto roams all three floors at 11-25% and is worth catching for breeding on Four Island. Wobbuffet is the true rarity at 1%.

Method
Floor
Type
Special encounters1
#150Mewtwo
Legendary Lv 70
1F23
Walking8
#047Parasect
25% - Lv 49–58
#082Magneton
20% - Lv 49
#042Golbat
14% - Lv 46–55
#132Ditto
11% - Lv 52–61
#057Primeape
11% - Lv 52–61
#067Machoke
10% - Lv 46
#101Electrode
5% - Lv 58
#202Wobbuffet
4% - Lv 55
Surf4
#054Psyduck
65% - Lv 30–50
FR
#079Slowpoke
65% - Lv 30–50
LG
#055Golduck
35% - Lv 40–55
FR
#080Slowbro
35% - Lv 40–55
LG
Fish9
Old Rod1
#129Magikarp
100% - Lv 5
Good Rod3
#060Poliwag
60% - Lv 5–15
#118Goldeen
20% - Lv 5–15
#129Magikarp
20% - Lv 5–15
Super Rod5
#060Poliwag
40% - Lv 15–25
#061Poliwhirl
40% - Lv 20–30
#130Gyarados
15% - Lv 15–25
#054Psyduck
5% - Lv 15–35
FR
#079Slowpoke
5% - Lv 15–35
LG
Rock Smash2
#074Geodude
65% - Lv 30–50
#075Graveler
35% - Lv 40–55
2F10
Walking8
#042Golbat
25% - Lv 49–58
#067Machoke
20% - Lv 49
#047Parasect
14% - Lv 52–61
#132Ditto
11% - Lv 55–64
#064Kadabra
11% - Lv 55–64
#082Magneton
10% - Lv 52
#202Wobbuffet
5% - Lv 58
#101Electrode
4% - Lv 61
Rock Smash2
#074Geodude
65% - Lv 35–55
#075Graveler
35% - Lv 45–60
B1F23
Walking8
#132Ditto
25% - Lv 58–67
#064Kadabra
25% - Lv 58–67
#047Parasect
14% - Lv 55–64
#042Golbat
11% - Lv 52–61
#067Machoke
10% - Lv 52
#082Magneton
10% - Lv 55
#101Electrode
4% - Lv 64
#202Wobbuffet
1% - Lv 61
Surf4
#054Psyduck
65% - Lv 40–60
FR
#079Slowpoke
65% - Lv 40–60
LG
#055Golduck
35% - Lv 50–65
FR
#080Slowbro
35% - Lv 50–65
LG
Fish9
Old Rod1
#129Magikarp
100% - Lv 5
Good Rod3
#060Poliwag
60% - Lv 5–15
#118Goldeen
20% - Lv 5–15
#129Magikarp
20% - Lv 5–15
Super Rod5
#060Poliwag
40% - Lv 15–25
#061Poliwhirl
40% - Lv 20–30
#130Gyarados
16% - Lv 15–35
#054Psyduck
4% - Lv 15–25
FR
#079Slowpoke
4% - Lv 15–25
LG
Rock Smash2
#074Geodude
65% - Lv 40–60
#075Graveler
35% - Lv 50–65
Legendary
Mewtwo
#150

Mewtwo

Psychic
Level
70
EV yield
3 Sp. Atk
Acquisition
Legendary
How to get itB1F
Static encounter deep inside Cerulean Cave after defeating the Elite Four
at B1F
Sealed locationB1FCerulean CaveView on map
One-of-a-kind. You only get a single shot per cartridge — knock it out or run, and it is gone for the run. Save before engaging.

ITEMS

PP Up, Full Restore, Max Revive, and a Nugget are spread across the floors. Hidden Ultra Balls reward thorough Itemfinder sweeps through this end-game dungeon.

Source
Floor
Vitamin1
PP Up
2F
Item ball4
Full Restore
1F
Max Elixir
1F
Max Revive
B1F
Nugget
1F
Hidden1
Ultra Ball
1F
VITAMIN

PP Up

Found on 2F
Effect

Slightly raises the maximum PP of a selected move for one Pokemon.

Vitamin1
VITAMIN

PP Up

Found on 2F
Effect

Slightly raises the maximum PP of a selected move for one Pokemon.

Item ball4
ITEM BALL

Full Restore

Found on 1F
Effect

A medicine that fully restores the HP and heals any status problems of one Pokemon.

ITEM BALL

Max Elixir

Found on 1F
Effect

Fully restores the PP of all moves for one Pokemon.

ITEM BALL

Max Revive

Found on B1F
Effect

A medicine that revives a fainted Pokemon, restoring HP fully.

ITEM BALL

Nugget

Found on 1F
Effect

A nugget of pure gold that gives off a lustrous gleam. It can be sold at a high price.

Hidden1
HIDDEN

Ultra Ball

Found on 1F
Effect

A very high-grade BALL that offers a higher Pokemon catch rate than a GREAT BALL.

Cerulean Cave Guide

  • After beating the Elite Four and completing the Sevii Islands sidequest for Celio. Once you deliver both the Ruby and Sapphire gems, the guard blocking the entrance in Cerulean City moves. You need Surf to get inside.

  • Wild Pokemon here go up to level 67, and Mewtwo itself is level 70. Bring a team of 65 or higher if you want to explore comfortably. The Wobbuffet encounters are annoying because Shadow Tag prevents fleeing, so pack some Repels for the deeper floors.

  • Deepest floor, B1F. You need Surf and Rock Smash to reach it. Save before interacting because it's one chance and there's no way back if you knock it out. Mewtwo is level 70, Psychic-type, and the strongest Pokemon available in FRLG.

  • Depends on what you're after. Repels block encounters below your lead Pokemon's level, so a level 20 lead in Rock Tunnel filters out the common level 15-16 Zubat while still triggering rarer spawns. If you're grinding, skip them. If you're just passing through, they save time and healing items.

  • Only Rock Tunnel is completely dark without Flash. Every other cave in FRLG is fully lit by default. Flash itself comes from Oak's aide on Route 2, and you only need 10 Pokedex entries to claim it.

  • Escape Rope warps you to the last entrance you used and costs 550 at most Poke Marts. The move Dig does the same thing for free if a Pokemon on your team knows it. Both work in any cave or dungeon in the game.

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