Abilities, Thick Fat

8 species have Thick Fat as a hidden ability, 18 as a normal one

Of the 1,025 species this site covers, default forms only

SinceGen III

Normal18

Hidden8

Elsewhere7

Effect, in PokéAPI's words

“Halves damage from Fire and Ice moves.”

As a hidden ability

Species	Slot	Note
Swinub	Hidden	Since Generation V
Piloswine	Hidden	Since Generation V
Mamoswine	Hidden	Since Generation V
Tepig	Hidden
Pignite	Hidden
Appletun	Hidden
Lechonk	Hidden
Oinkologne	Hidden

As a normal ability

Species	Slot	Note
Seel	Normal
Dewgong	Normal
Snorlax	Normal
Marill	Normal
Azumarill	Normal
Miltank	Normal
Makuhita	Normal
Hariyama	Normal
Azurill	Normal
Spoink	Normal
Grumpig	Normal
Spheal	Normal
Sealeo	Normal
Walrein	Normal
Purugly	Normal
Munchlax	Normal
Cetoddle	Normal
Cetitan	Normal

Elsewhere in PokéAPI

7 more holders without a page here

Alternate forms and other species that PokéAPI lists with Thick Fat.

Venusaur Mega, Rattata Alola (hidden), Raticate Alola (hidden), Raticate Totem Alola (hidden), Snorlax Gmax, Appletun Gmax (hidden), Oinkologne Female (hidden)