Yellow Cerulean Cave
Beyond a postgame barrier near Cerulean City lies a lair of powerful wild Pokemon hiding Mewtwo, the strongest creature in Kanto.
Cerulean Cave is in Kanto, with its entrance in Cerulean City. In the story it comes after Indigo Plateau.
CERULEAN CAVE MAP
Ladders run up to a second floor and down into a flooded basement where the water spreads too wide to cross on foot, so bring Surf before heading down to the lake.
Cerulean Cave Walkthrough
1F
- From the entrance, SurfMoveSurfWaterClassSpecialPower95Accuracy100%PP15A strong water-type attack. the south channel west to its north bank for the Max Elixir near 1F's southwesternmost ladder. B1F hides another northeast of its landing.
- Ride on to the west end, climb that ladder, then cross the 2F pocket east to its ladder down.
- SurfMoveSurfWaterClassSpecialPower95Accuracy100%PP15A strong water-type attack. the east pool to the Rare Candy by the southeast corner of 1F. Its twin lies in the west of 2F, after the easternmost ladder in the northeast.
Max Elixir
Max Revive
PP Up
Rare Candy2F
- Climb the ladder west of the pool, walk this pocket of 2F to the Full Restore in the east, and take the corner ladder down to 1F.
- Head west along the north of 1F, climb the far ladder, then wind through the west pocket upstairs and back down beside the basement ladder.
Full RestoreB1F
- From the landing, loop west and north to the top, follow it east, then head south down the middle to the lake.
- SurfMoveSurfWaterClassSpecialPower95Accuracy100%PP15A strong water-type attack. east and up the channel, climb to the north ledges, then wind east and back south to the next pool.
- SurfMoveSurfWaterClassSpecialPower95Accuracy100%PP15A strong water-type attack. that pool west, south and east to the ledge, then walk north to battle MewtwoDoes not evolve. Save first: knocking it out removes it for good.
Pokemon Encounters
The lowest floor holds Mewtwo at level 70, the strongest catch anywhere in the game. The wild Pokemon run level 50 and up. Chansey at 5 percent is the standout among Rhydon, Sandslash, and a Ditto scattered across several rarity slots.
Old Rod1
Good Rod2
Super Rod2
Old Rod1Good Rod2Super Rod2Mewtwo
ITEMS
Kanto's deepest dungeon carries loot to match: Max Revive, Max Elixir, a Full Restore, and an Ultra Ball, plus a hidden PP Up for your strongest move. A Rare Candy sits in the depths.
PP Up
Raises a move’s max PP by 20%.
PP Up
Raises a move’s max PP by 20%.
Rare Candy
Causes a level-up and raises happiness.
Max Elixir
Restores PP to full for each move.
Max Revive
Revives with full HP.
Ultra Ball
Tries to catch a wild Pokémon. Success rate is 2×.
Full Restore
Restores HP to full and cures any status ailment and confusion.
Cerulean Cave Guide
Yes, for one reason: Mewtwo. The level 70 Psychic legend waits at the bottom, the single strongest catch in the game and the marquee reason to come back. The catch is that the cave only unseals once you're Champion, so it's strictly a victory-lap detour after the credits.
Built to survive a long descent, not just the boss. The lower floors swarm with level 50-plus Golbat, Graveler, and even wild Chansey, so pack healing and a Pokemon that takes hits well. For Mewtwo itself at level 70, sleep or paralysis makes the capture far steadier than trading blows.
Save it for Rock Tunnel and skip it everywhere else. That's the one cave the game leaves unlit, and pushing through blind while Zubat swarm you is rough. No other cave is dark, so Flash is otherwise a wasted move slot. Grab HM05 from Oak's Aide and hand it to a benched Pokemon just before that descent.
There's only Victory Road. Cerulean Cave would be the other option, but it stays locked until you're Champion. Since you climb Victory Road on the way to the League anyway, a lap or two there doubles as a final tune-up.