Cerulean Cave

23 species to catch in 3 areas of this location, across 11 game versions.

Data from Pokemon HeartGold only: exact levels and the encounter rate for each Pokémon.

in tall grass

Conditional slots 21 for 10 species — time of day, weather, radio and other switches

The game keeps these slots separate from the base ones. Condition sets exclude each other (it cannot be morning and night at once), and the source does not say whether a condition adds a slot or replaces the whole table — so we list them row by row instead of adding them to the rate on the tile.

Pokémon	Conditions	Level	Rate
Golbat	at night	38–42	48%
	radio off	38–47	30%
Parasect	in the morning	38	20%
	during the day	38	20%
	radio off, at night	38	10%
Primeape	radio off, in the morning	38	10%
	radio off, during the day	38	10%
Machoke	in the morning	39–42	28%
	during the day	39–42	28%
	radio off	39–45	20%
	at night	39–40	2%
Magneton	radio off	40–45	30%
	in the morning	39	1%
	during the day	39	1%
Ditto	radio off	39–45	30%
	in the morning	40	1%
	during the day	40	1%
Makuhita	radio on Hoenn Sound	39–45	50%
Absol	radio on Hoenn Sound	38–47	50%
Chingling	radio on Sinnoh Sound	39–45	50%
Bronzor	radio on Sinnoh Sound	38–47	50%

while surfing (Surf)

with the Good Rod

Conditional slots 3 for 2 species — time of day, weather, radio and other switches

The game keeps these slots separate from the base ones. Condition sets exclude each other (it cannot be morning and night at once), and the source does not say whether a condition adds a slot or replaces the whole table — so we list them row by row instead of adding them to the rate on the tile.

Pokémon	Conditions	Level	Rate
Poliwag	at night	20	30%
Goldeen	in the morning	20	30%
	during the day	20	30%

with the Old Rod

with the Super Rod

Conditional slots 3 for 2 species — time of day, weather, radio and other switches

The game keeps these slots separate from the base ones. Condition sets exclude each other (it cannot be morning and night at once), and the source does not say whether a condition adds a slot or replaces the whole table — so we list them row by row instead of adding them to the rate on the tile.

Pokémon	Conditions	Level	Rate
Poliwag	at night	40	90%
Poliwhirl	in the morning	40	90%
	during the day	40	90%

by smashing rocks (Rock Smash)

static, set by the game

The red marker is Cerulean Cave. A diagram, not a world map — distances are not to scale, but directions and connections match the game. The legend below the drawing explains each symbol.

• Route — number inside
• Sea route — Surf only
• City
• Pokémon League
• Interior — cave, forest, tower; placed next to its entrance
• Path between places
• Path that requires Surf
• Entrance to an interior — not a passage to the other side