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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 to enter.

Items

Generation I

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 inbetween Generation I and Generation II.