"Drowzee's Got a Dirty Secret"

Let's look at Drowzee's dex entries:Red/Blue: "Puts enemies to sleep then eats their dreams. Occasionally gets sick from eating bad dreams."Gold: "If you think that you had a good dream, but you can't remember it, a Drowzee has probably eaten it."Emerald: "If your nose becomes itchy while you are sleeping, it's a sure sign that a Drowzee is standing above your pillow and trying to eat your dream through your nostrils."SoulSilver: "It remembers every dream it eats. It rarely eats the dreams of adults because children's are much tastier."Ultra Moon: "It puts its prey to sleep and devours their dreams. It seems that bad dreams taste sour, so Drowzee doesn't particularly like eating them."Nearly every single generation of games has Dex entries describing Drowzee and Hypno's affinity for eating dreams, but there's just one problem:DROWZEE CANNOT LEARN DREAM EATER BY LEVELING UP OR BREEDING.How is Drowzee's dream eating so ubiquitous that practically every game where it can be caught mentions the habit, when it can only learn Dream Eater by artificial means like TM or Move Tutor?! via /r/pokemon https://ift.tt/2HCjBpv