7 species have Sturdy as a hidden ability, 35 as a normal one

Effect, in PokéAPI's words

“Prevents being KOed from full HP, leaving 1 HP instead. Protects against the one-hit KO moves regardless of HP.”

As a hidden ability

Species	Slot	Note
Relicanth	Hidden	Since Generation V
Regirock	Hidden	Since Generation V
Tyrunt	Hidden
Carbink	Hidden
Bergmite	Hidden
Avalugg	Hidden
Togedemaru	Hidden

As a normal ability

Species	Slot	Note
Geodude	Normal
Graveler	Normal
Golem	Normal
Magnemite	Normal
Magneton	Normal
Onix	Normal
Sudowoodo	Normal
Pineco	Normal
Forretress	Normal
Steelix	Normal
Shuckle	Normal
Skarmory	Normal
Donphan	Normal
Nosepass	Normal
Aron	Normal
Lairon	Normal
Aggron	Normal
Shieldon	Normal
Bastiodon	Normal
Bonsly	Normal
Magnezone	Normal
Probopass	Normal
Roggenrola	Normal
Boldore	Normal
Gigalith	Normal
Sawk	Normal
Dwebble	Normal
Crustle	Normal
Tirtouga	Normal
Carracosta	Normal
Cosmoem	Normal
Nacli	Normal
Naclstack	Normal
Garganacl	Normal
Archaludon	Normal

Elsewhere in PokéAPI

6 more holders without a page here

Alternate forms and other species that PokéAPI lists with Sturdy.

Geodude Alola, Graveler Alola, Golem Alola, Togedemaru Totem (hidden), Avalugg Hisui (hidden), Ogerpon Cornerstone Mask