I'm 100% sure Munna isn't a pre-evo of Drowzee.
There's the fact that Drowzee and Hypno are classified as the Hypnosis Pokemon.
Munna is the Dream Eater Pokemon. Most Pokemon don't change their classification when they evolve.
Also, why would a pink, feminine Pokemon with FLOWERS ON IT evolve into some yellow pig-like Pokemon that's bipedal? The only reason why people say Munna might evolve into Drowzee is because it (barely) has a snout like Drowzee and Hypno, and it's a Psychic-type. >.>
There's the fact that Drowzee and Hypno are classified as the Hypnosis Pokemon.
Munna is the Dream Eater Pokemon. Most Pokemon don't change their classification when they evolve.
Also, why would a pink, feminine Pokemon with FLOWERS ON IT evolve into some yellow pig-like Pokemon that's bipedal? The only reason why people say Munna might evolve into Drowzee is because it (barely) has a snout like Drowzee and Hypno, and it's a Psychic-type. >.>