If a Pokémon with Cute Charm is hit by a move that makes contact, there is a 30% chance the attacker will become infatuated. It will not infatuate Pokémon of the same gender, genderless Pokémon, nor those with the ability Oblivious.
Infatuated Pokémon have a 50% chance of being "immobilized by love" each turn and unable to attack.
If a Pokémon with Cute Charm is the leading party Pokémon, the chance of encountering a Pokémon of the opposite gender is 2/3.