Munnas pokedex entry says when it eats a food dream it expels pink mist, but what happens when it eats a bad dream? Or a weird dream? Or a whatever dream?

The mist takes on different colors, consistencies, and odors, anonymous. Particularly foul dreams create thick clouds of foul-smelling mist the color and odor of rancid garbage, for example. As for dreams that can’t quite be described as bad or good, those tend to be multi-colored and rather bland in terms of smell.