Old Chateau

3 species to catch in 9 areas of this location, across 3 game versions.

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

in tall grass

Conditional slots 6 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
Gastly	with no cartridge in slot 2	17	4%
Gengar	with a cartridge in slot 2: Ruby	17	4%
	with a cartridge in slot 2: Sapphire	17	4%
	with a cartridge in slot 2: Emerald	17	4%
	with a cartridge in slot 2: FireRed	17	4%
	with a cartridge in slot 2: LeafGreen	17	4%

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
Rotom	at night	20	100%