5 species have Keen Eye as a hidden ability, 34 as a normal one

Effect, in PokéAPI's words

“Prevents accuracy from being lowered.”

As a hidden ability

Species	Slot	Note
Glameow	Hidden	Since Generation V
Stunky	Hidden	Since Generation V
Skuntank	Hidden	Since Generation V
Skorupi	Hidden	Since Generation V
Drapion	Hidden	Since Generation V

As a normal ability

Species	Slot	Note
Pidgey	Normal
Pidgeotto	Normal
Pidgeot	Normal
Spearow	Normal
Fearow	Normal
Farfetch’d	Normal
Hitmonchan	Normal
Sentret	Normal
Furret	Normal
Hoothoot	Normal
Noctowl	Normal
Sneasel	Normal
Skarmory	Normal
Wingull	Normal
Pelipper	Normal
Sableye	Normal
Starly	Normal
Chatot	Normal
Patrat	Normal
Watchog	Normal
Ducklett	Normal
Swanna	Normal
Rufflet	Normal
Braviary	Normal
Espurr	Normal
Meowstic	Normal
Pikipek	Normal
Trumbeak	Normal
Toucannon	Normal
Rockruff	Normal
Lycanroc	Normal
Rookidee	Normal
Corvisquire	Normal
Bombirdier	Normal

Elsewhere in PokéAPI

4 more holders without a page here

Alternate forms and other species that PokéAPI lists with Keen Eye.

Meowstic Female, Lycanroc Midnight, Sneasel Hisui, Braviary Hisui