Union Cave

18 species to catch in 3 areas of this location, across 5 game versions.

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

in tall grass

while surfing (Surf)

with the Good Rod

Conditional slots 9 for 4 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
Krabby	during the day	20	35%
	at night	20	35%
	in the morning	20	35%
Staryu	at night	20	10%
Magikarp	during the day	20	35%
	in the morning	20	35%
	at night	20	35%
Corsola	during the day	20	10%
	in the morning	20	10%

with the Old Rod

with the Super Rod

static, set by the game

Conditional slots 1 for 1 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
Lapras	day of the week: Friday	20	100%

The red marker is Union 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
• 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