Under no circumstances should anyone ever allow a Smoochum to kiss them, for its kiss is far more dangerous than even that of a fully-grown Jynx. Jynx only steal luck – certainly an important thing, but even the cursed can manage to trudge stubbornly onwards. And Smoochum, despite their youth, steal far more.
The first kiss of a Smoochum, the so-called sweet kiss, can be placed anywhere on the skin, and will cause the victim to hallucinate a series of bizarre and fantastic visions and sounds. A small number of fools have sought out Smoochum for that very reason, but most stick to other pokemon like Ivysaur, which are far less dangerous to the victim. For inevitably the vision will center on a short but beautiful woman, who gives them a lovely and wonderful kiss on the lips. The woman is the Smoochum, so well disguised by the powerful illusions of the previous kiss that none ever stop to wonder where she came from, or where the Smoochum went. And like a Sleeping Beauty in reverse, this kiss robs them of their waking hours, and they slumber for years or even decades.
Smoochum do not kiss out of cruelty, but for warmth and energy; they must rob the victims of their waking hours in order to survive in their cold mountain homes, where sleep means being buried under an avalanche. When they finally evolve into Jynx, they will take special care to protect those they have kissed from danger – sometimes from afar, others by protecting their victims' still-sleeping bodies from the elements. After all, it is noteworthy that none who have fallen asleep in this way report having nightmares; the nightmare is what happens once they wake up.