What Pokémon can you catch at Pokemon Mansion?

Grimer, Growlithe, Koffing, Muk, Ponyta, Weezing, Vulpix, and Raticate and 3 more Pokémon can be caught at Pokemon Mansion in the Kanto region.

Which games have wild Pokémon encounters at Pokemon Mansion?

Pokemon Mansion has encounter data for Pokémon Red, Blue, Yellow, FireRed, and LeafGreen.

Pokemon Mansion

11 Pokémon can be caught at Pokemon Mansion in Kanto — highlighted on the map below.

An abandoned residence on Cinnabar Island, the Pokémon Mansion once belonged to a Pokémon researcher and is strongly implied to be the site where Mewtwo was created. On the Generation I Town Map its name appears shortened to PKMN Mansion.

Pokémon at Pokemon Mansion

Game

1F - 1st Floor

Pokémon	Games	Method	Levels	Rarity
Grimer	Blue	Walking	30-32	Common
Koffing	Red	Walking	30-32	Common
Ponyta	RedBlue	Walking	28-34	Common
Raticate	Yellow	Walking	34-37	Common
Rattata	Yellow	Walking	34-37	Common
Grimer	Yellow	Walking	23-26	Uncommon
Growlithe	Red	Walking	34	Uncommon
Growlithe	Yellow	Walking	26-38	Uncommon
Vulpix	Blue	Walking	34	Uncommon
Grimer	Red	Walking	30	Rare
Koffing	Blue	Walking	30	Rare
Muk	Red	Walking	39	Rare
Muk	Blue	Walking	37	Rare
Weezing	Red	Walking	37	Rare
Weezing	Blue	Walking	39	Rare

1F/2F/3F

Pokémon	Games	Method	Levels	Rarity
Grimer	LeafGreen	Walking	28-30	Common
Koffing	FireRed	Walking	28-30	Common
Raticate	FireRedLeafGreen	Walking	32-36	Common
Growlithe	FireRed	Walking	30-32	Uncommon
Rattata	FireRedLeafGreen	Walking	26-28	Uncommon
Vulpix	LeafGreen	Walking	30-32	Uncommon
Grimer	FireRed	Walking	28	Rare
Koffing	LeafGreen	Walking	28	Rare
Muk	LeafGreen	Walking	32	Rare
Weezing	FireRed	Walking	32	Rare

2F - 2nd Floor

Pokémon	Games	Method	Levels	Rarity
Grimer	Blue	Walking	30-34	Common
Grimer	Yellow	Walking	26-35	Common
Growlithe	Red	Walking	32	Common
Koffing	Red	Walking	30-34	Common
Ponyta	RedBlue	Walking	28-32	Common
Raticate	Yellow	Walking	37-40	Common
Rattata	Yellow	Walking	37-40	Common
Vulpix	Blue	Walking	32	Common
Grimer	Red	Walking	30	Rare
Koffing	Blue	Walking	30	Rare
Muk	Red	Walking	37	Rare
Muk	Blue	Walking	39	Rare
Muk	Yellow	Walking	35-38	Rare
Weezing	Red	Walking	39	Rare
Weezing	Blue	Walking	37	Rare

3F - 3rd Floor

Pokémon	Games	Method	Levels	Rarity
Grimer	Blue	Walking	31-35	Common
Grimer	Yellow	Walking	32-38	Common
Koffing	Red	Walking	31-35	Common
Ponyta	Red	Walking	32-36	Common
Raticate	Yellow	Walking	40-43	Common
Rattata	Yellow	Walking	40-43	Common
Growlithe	Red	Walking	33	Uncommon
Muk	Blue	Walking	38-40	Uncommon
Ponyta	Blue	Walking	32-36	Uncommon
Vulpix	Blue	Walking	33	Uncommon
Weezing	Red	Walking	38-40	Uncommon
Grimer	Red	Walking	34	Rare
Koffing	Blue	Walking	34	Rare
Magmar	Blue	Walking	38	Rare
Muk	Red	Walking	42	Rare
Muk	Yellow	Walking	38-41	Rare
Weezing	Blue	Walking	42	Rare

B1F - Basement 1st Floor

Pokémon	Games	Method	Levels	Rarity
Grimer	Blue	Walking	31-33	Common
Grimer	Yellow	Walking	35-38	Common
Grimer	LeafGreen	Walking	28-30	Common
Koffing	Red	Walking	31-33	Common
Koffing	FireRed	Walking	28-30	Common
Raticate	Yellow	Walking	37-46	Common
Raticate	FireRedLeafGreen	Walking	34-38	Common
Ditto	Yellow	Walking	12-24	Uncommon
Ditto	FireRedLeafGreen	Walking	30	Uncommon
Growlithe	Red	Walking	35	Uncommon
Growlithe	FireRed	Walking	30-32	Uncommon
Muk	Blue	Walking	40	Uncommon
Muk	Yellow	Walking	41	Uncommon
Ponyta	RedBlue	Walking	32-34	Uncommon
Vulpix	Blue	Walking	35	Uncommon
Vulpix	LeafGreen	Walking	30-32	Uncommon
Weezing	Red	Walking	40-42	Uncommon
Grimer	Red	Walking	35	Rare
Grimer	FireRed	Walking	28	Rare
Koffing	Blue	Walking	35	Rare
Koffing	LeafGreen	Walking	28	Rare
Magmar	Blue	Walking	38	Rare
Muk	Red	Walking	42	Rare
Muk	LeafGreen	Walking	34	Rare
Rattata	FireRedLeafGreen	Walking	26	Rare
Weezing	Blue	Walking	42	Rare
Weezing	FireRed	Walking	34	Rare