7 species have Intimidate as a hidden ability, 28 as a normal one

Effect, in PokéAPI's words

“Lowers opponents' Attack one stage upon entering battle.”

As a hidden ability

Species	Slot	Note
Qwilfish	Hidden	Since Generation V
Scraggy	Hidden
Scrafty	Hidden
Litten	Hidden
Torracat	Hidden
Incineroar	Hidden
Overqwil	Hidden

As a normal ability

Species	Slot	Note
Ekans	Normal
Arbok	Normal
Growlithe	Normal
Arcanine	Normal
Tauros	Normal
Gyarados	Normal
Snubbull	Normal
Granbull	Normal
Stantler	Normal
Hitmontop	Normal
Mightyena	Normal
Masquerain	Normal
Mawile	Normal
Salamence	Normal
Staravia	Normal
Staraptor	Normal
Shinx	Normal
Luxio	Normal
Luxray	Normal
Herdier	Normal
Stoutland	Normal
Sandile	Normal
Krokorok	Normal
Krookodile	Normal
Wyrdeer	Normal
Squawkabilly	Normal
Maschiff	Normal
Mabosstiff	Normal

Elsewhere in PokéAPI

12 more holders without a page here

Alternate forms and other species that PokéAPI lists with Intimidate.

Landorus Therian, Manectric Mega, Growlithe Hisui, Arcanine Hisui, Qwilfish Hisui (hidden), Tauros Paldea Combat Breed, Tauros Paldea Blaze Breed, Tauros Paldea Aqua Breed, Squawkabilly Blue Plumage, Squawkabilly Yellow Plumage, Squawkabilly White Plumage, Scrafty Mega