8 species have Contrary as a hidden ability, 2 as a normal one

Effect, in PokéAPI's words

“Inverts stat changes.”

As a hidden ability

Species	Slot	Note
Shuckle	Hidden	Since Generation V
Spinda	Hidden	Since Generation V
Snivy	Hidden
Servine	Hidden
Serperior	Hidden
Fomantis	Hidden
Lurantis	Hidden
Enamorus	Hidden

As a normal ability

Species	Slot	Note
Inkay	Normal
Malamar	Normal

Elsewhere in PokéAPI

3 more holders without a page here

Alternate forms and other species that PokéAPI lists with Contrary.

Lurantis Totem (hidden), Malamar Mega, Staraptor Mega