Cute Charm

Has a 30% chance of infatuating attacking Pokémon on contact.

Full effect

Whenever a move makes contact with this Pokémon, the move's user has a 30% chance of being infatuated. Overworld: If the first Pokémon in the party has this ability, any wild Pokémon whose species can be either gender has a 2/3 chance of being set to the opposite gender, and a 1/3 chance of having a random gender as usual.

In game description

The Pokémon may infatuate attackers that make direct contact with it.

Pokemon with Cute Charm

#0035

Clefairy #0036

Clefable #0039

Jigglypuff #0040

Wigglytuff #0173

Cleffa #0174

Igglybuff #0300

Skitty #0301

Delcatty #0350

Milotic hidden #0428

Lopunny #0572

Minccino #0573

Cinccino #0700

Sylveon #0759

Stufful hidden #0905

Enamorus Incarnate

Using Cute Charm in Cobblemon

Abilities are passive and always active, so Cute Charm costs you nothing to run. If it is marked hidden on a species above, expect it to be harder to obtain: servers differ in whether hidden abilities come from breeding, an Ability Patch, or events.

See the Pokedex for which abilities each species can have, and IVs, EVs and breeding for how to actually pass one down.