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Now that you're the undisputed Pokémon League champion, it's time to capture the experimental Pokémon known as Mewtwo. If you select Continue after the credits roll, you'll pick up where you left off, with all of your Pokémon intact. Go back to Route 24, just north of Cerulean City. Dive into the water and Surf south until you reach a cave. Mewtwo is in there, on the lowest level.

One last challenge[edit]

The game's not over quite yet. After the ending, the game will automatically be saved. Load it up any time afterwards and you'll find yourself where it all began, at your home in Pallet Town. Nothing has changed anywhere in the world, except for one small detail. The guy standing outside of the cave right outside of Route 4 is gone, and you can now enter the game's final dungeon. To get there, you'll need to go up to Route 24 and Surf to the south, or just go up to Nugget Bridge and Surf on the river beside it and go west.

The only real treasure in this cave is Mewtwo, the Pokémon that awaits at the end, a la Zapdos, Articuno, and Moltres. It's even harder to catch than those three, though, so hit a Poké Center first and get out that Master Ball. In addition to Mewtwo, the Cerulean Cave is one last opportunity to catch some rare Pokémon and fill up your Poké-Dex. You can get Pokémon that were previously only available in the Safari Zone. like Chansey and Rhyhorn, as well as evolved forms of more common Pokémon.

The dungeon's layout differs drastically between the Red/Blue and Yellow games, so both maps are presented here. Getting to the end is easier in Red/Blue, where you can go straight to point E, then to F and G. Yellow players will need to hit each and every ladder from A to G in order.

In Red/Blue there is a hidden Rare Candy on the differently colored rock next to ladder D on the 1st floor. There is also a hidden Ultra Ball on the differently colored rock in the top-right corner of Basement 1. In Yellow there are hidden PP UPs by every "lonely rock" on 2nd (close to pokeball C) and 1st floor (Close to ladder C).

Pokémon Red and Blue[edit]

2F[edit]

Red/Blue Cerulean Cave 2F
A Full Restore
B PP Up
C Ultra Ball

Pokémon found[edit]

Red and Blue
Pokémon Level Rate
Wigglytuff Wigglytuff 54 5%
Venomoth Venomoth 51 15%
Kadabra Kadabra 51 15%
Dodrio Dodrio 51 25%
Electrode Electrode 52 10%
Marowak Marowak 52 10%
Rhydon Rhydon 52 10%
Chansey Chansey 56 5%
Ditto Ditto 55,60 5%

1F[edit]

Red/Blue Cerulean Cave 1F
A Nugget
B Max Elixer
C Full Restore

Pokémon found[edit]

Red
Pokémon Level Rate
Arbok Arbok 52 10%
Raichu Raichu 53 4%
Golbat Golbat 46 20%
Parasect Parasect 52 5%
Venomoth Venomoth 49 10%
Kadabra Kadabra 49 5%
Magneton Magneton 46 15%
Dodrio Dodrio 49 10%
Hypno Hypno 46 20%
Ditto Ditto 53 1%
Blue
Pokémon Level Rate
Raichu Raichu 53 4%
Sandslash Sandslash 52 10%
Golbat Golbat 46 20%
Parasect Parasect 52 5%
Venomoth Venomoth 49 10%
Kadabra Kadabra 49 5%
Magneton Magneton 46 15%
Dodrio Dodrio 49 10%
Hypno Hypno 46 20%
Ditto Ditto 53 1%
Red and Blue
Pokémon Level Old Rod Good Rod Super Rod
Magikarp Magikarp 5 100% - -
Poliwag Poliwag 10 - 50% -
Goldeen Goldeen 10 - 50% -
Slowbro Slowbro 23 - - 25%
Kingler Kingler 23 - - 25%
Seadra Seadra 23 - - 25%
Seaking Seaking 23 - - 25%

B1F[edit]

Red/Blue Cerulean Cave B1F
A Max Revive
B Ultra Ball

Pokémon found[edit]

Red
Pokémon Level Rate
Arbok Arbok 57 5%
Raichu Raichu 64 10%
Parasect Parasect 64 10%
Electrode Electrode 55 15%
Marowak Marowak 55 15%
Rhydon Rhydon 55 25%
Chansey Chansey 64 10%
Ditto Ditto 63,65,67 10%
Blue
Pokémon Level Rate
Raichu Raichu 64 10%
Sandslash Sandslash 57 5%
Parasect Parasect 64 10%
Electrode Electrode 55 15%
Marowak Marowak 55 15%
Rhydon Rhydon 55 25%
Chansey Chansey 64 10%
Ditto Ditto 63,65,67 10%
Red and Blue
Pokémon Level Old Rod Good Rod Super Rod
Magikarp Magikarp 5 100% - -
Poliwag Poliwag 10 - 50% -
Goldeen Goldeen 10 - 50% -
Slowbro Slowbro 23 - - 25%
Kingler Kingler 23 - - 25%
Seadra Seadra 23 - - 25%
Seaking Seaking 23 - - 25%

Pokémon Yellow[edit]

2F[edit]

Yellow Cerulean Cave 2F
A Rare Candy
B Ultra Ball
C Max Revive
D Full Restore

Pokémon found[edit]

Yellow
Pokémon Level Rate
Sandslash Sandslash 56 10%
Golbat Golbat 52,57 40%
Gloom Gloom 58 5%
Weepinbell Weepinbell 58 5%
Graveler Graveler 50 15%
Rhyhorn Rhyhorn 50 10%
Rhydon Rhydon 58,60 5%
Ditto Ditto 60 10%

1F[edit]

Yellow Cerulean Cave 1F
A Ultra Ball
B Max Revive
C Max Elixer
D Rare Candy

Pokémon found[edit]

Yellow
Pokémon Level Rate
Sandslash Sandslash 52 10%
Golbat Golbat 50,55 40%
Gloom Gloom 55 10%
Parasect Parasect 54 5%
Venomoth Venomoth 54 5%
Weepinbell Weepinbell 55 10%
Graveler Graveler 45 15%
Ditto Ditto 55,60 5%
Yellow
Pokémon Level Old Rod Good Rod Super Rod
Magikarp Magikarp 5 100% - -
Poliwag Poliwag 10 - 50% -
Goldeen Goldeen 10 - 50% -
Goldeen Goldeen 25 - - 40%
Seaking Seaking 35,45,55 - - 60%

B1F[edit]

Yellow Cerulean Cave B1F
A Ultra Ball
B Max Elixer
C Ultra Ball
D Max Revive

Pokémon found[edit]

Yellow
Pokémon Level Rate
Golbat Golbat 54,59 40%
Graveler Graveler 55 15%
Lickitung Lickitung 50,55 5%
Rhyhorn Rhyhorn 52 10%
Rhydon Rhydon 62 10%
Chansey Chansey 56 5%
Ditto Ditto 60,65 15%
Yellow
Pokémon Level Old Rod Good Rod Super Rod
Magikarp Magikarp 5 100% - -
Poliwag Poliwag 10 - 50% -
Goldeen Goldeen 10 - 50% -
Goldeen Goldeen 30 - - 40%
Seaking Seaking 40,50,60 - - 60%

Mewtwo[edit]

#150 Mewtwo
Mastering Mewtwo
To reach Mewtwo, use the maps to follow the ladders back and forth between the levels. Follow the ladders in order from A to G. Once you reach the lowest level, go to the bottom-right corner to find Mewtwo. The only guaranteed way to capture Mewtwo is to use the Master Ball you received from the president of Silph Co. If you have the Master Ball don't bother fighting; just use it right away. If you don't have the Master Ball, you'll have to snare Mewtwo the old-fashioned way.
Pokemon 150Mewtwo.png

Not only is Mewtwo the strongest Pokémon in the game, but it starts at level 70. So if you're trying to catch it with Ultra Balls, the experience will make catching Zapdos seem like a picnic by comparison. You can whittle it down with power techniques like Thunder and Blizzard, but it might just Recover all that health back. It's weak to Bug attacks, but most Bug Pokémon don't actually learn any Bug attacks beyond Leech Life. Beedrill and Jolteon both learn Pin Missile, which is pretty good, but Mewtwo's Psychic attack will lay waste to just about any Pokémon except for other Psychics. It's a tough fight, but it won't matter if you still have that Master Ball… Just toss it on turn one and start thinking of nicknames for your new pet. The easiest way to get Mewtwo without a Master Ball is to attack it with Articuno's Blizzard and Ice Beam until you freeze him. Because Mewtwo cannot change out of frozen status until you attack him with fire or use Haze, it should be extremely easy to catch.

Mewtwo is simply the best Pokémon in the game with phenomenal stats in every category.