Cerulean Cave

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Cerulean Cave (1st Floor) as it appears in Pokémon FireRed and LeafGreen.

Cerulean Cave (Japanese: ハナダのどうくつ, Hepburn: Hanada no Dōkutsu), popularly known as the "Unknown Dungeon" (Japanese: ななしのどうくつ, Hepburn: Nanashi no Dōkutsu), is in the northwest of Cerulean City. It is located in the Kanto region and was first introduced in Gen I. You must have defeated the Pokémon League in order to enter in Gen I. In Gen III, you must also complete the Sevii Islands Quest.

Pokémon

Red and Blue

Mewtwo	Level: 70	Type:
	Ability: None	Held item: None

Yellow

Mewtwo	Level: 70	Type:
	Ability: None	Held item: None

Red and Green

Mewtwo	Level: 70	Type:
	Ability: None	Held item: None

FireRed and LeafGreen

Mewtwo	Level: 70	Type:
	Ability: Pressure	Held item: None

HeartGold and SoulSilver

Mewtwo	Level: 70	Type:
	Ability: Pressure	Held item: None

Items

Pokémon Red, Green and Blue

• Full Restore: on the riverbank near the southwest corner of the first floor; center of the second floor
• Max Elixir: on the riverbank on the first floor
• Max Revive: north edge of the basement
• Nugget: near the northwest corner of the first floor
• PP Up: east edge of the second floor
• Ultra Ball: southwest corner of the second floor; center of the basement

Pokémon Yellow

• Full Restore: east edge of the second floor
• Max Elixir: west of the entrance on the first floor; north edge of the basement
• Max Revive: east edge of the first floor; southeast of the second floor's center; center of an elevated area in the basement
• Rare Candy: southeast corner of the first floor; west edge of the second floor
• Ultra Ball: center of the first floor; center of the second floor; center of an elevated area in the basement; northeast corner of the basement

Generation III

• Full Restore: on the riverbank near the southwest corner of the first floor; against the eastern edge of the second floor
• Max Elixir: near the center of the first floor
• Max Revive: in the northeast corner of the basement
• Nugget: in the northwest corner of the first floor
• PP Up: near the southwest corner of the second floor
• Ultra Ball: near the southeast corner of the second floor; near the center of the basement

Trivia

• In Generation I, any Pokémon that can only be found in the Cerulean Cave is listed as "area unknown" in the Pokédex. This was fixed in Generation III, however. Whether this was intended or just a glitch is unknown (most likely a glitch).
• Though its design varies with each iteration, the version of it found in Pokémon FireRed and LeafGreen and Pokémon HeartGold and SoulSilver is very similar to the one in the original Pokémon Red and Green, which was never released outside of Japan. The only difference is the Generation III addition of Rock Smash boulders.
• In Generation II, Cerulean Cave was inaccessible. A NPC nearby states how the cave collapsed in between Generation I and Generation II.
• In this place, you can find Mewtwo on the 1st floor.

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