Ilex Forest

17 species to catch in 1 area of this location, across 5 game versions.

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

in tall grass

Conditional slots 17 for 9 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
Caterpie	during the day	5–6	40%
	in the morning	5	20%
	radio off, in the morning	5–6	20%
	radio off, during the day	5–6	20%
Metapod	in the morning	6	20%
	radio off, in the morning	6	10%
	radio off, during the day	6	10%
	during the day	5	5%
Zubat	radio off, at night	6	10%
Oddish	at night	5–6	40%
	radio off, at night	5–6	20%
Paras	in the morning	5	5%
	at night	5	5%
Numel	radio on Hoenn Sound	6	10%
Spoink	radio on Hoenn Sound	5–6	20%
Budew	radio on Sinnoh Sound	5–6	20%
Carnivine	radio on Sinnoh Sound	6	10%

while surfing (Surf)

with the Good Rod

with the Old Rod

with the Super Rod

by headbutting trees (Headbutt)

Conditional slots 7 for 6 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
Caterpie	common tree	3–5	15%
Metapod	common tree	3–5	5%
Butterfree	rare tree	6–8	5%
Hoothoot	common tree	3–5	50%
	rare tree	6–8	50%
Noctowl	rare tree	6–8	10%
Pineco	rare tree	6–8	15%

The red marker is Ilex Forest. 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