Drowzee

Drowsey seems such an innocuous Pokémon that it surely could only have something lighthearted written about it, right? Wrong. It turns out it’s one of the most nightmarish Pokémon of all time. Don’t let it near your children.
Violet’s entry is pretty ordinary, although with an edge of creepy:
When it twitches its nose, it can tell where someone is sleeping and what that person is dreaming about.
But Scarlet’s is just plain terrifying. Horror movie elevator pitch stuff:
It remembers every dream it eats. It rarely eats the dreams of adults because children’s are much tastier.
Hard nope.