Munnas are at the Dream yard. If you are asking for a shiny munna, I think it is in the Dreamyard as well. Shiny munnas are yellow with green flowers. Regular munnas are pink with purple flowers. Here are the images of both munnas.
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You get Munna at the Dreamyard.
Munna and Sigilyph.
Moon Stone!
you find it at the dream yard
The only Pokemon from Black/White you can evolve with a moon stone is Munna to Musharna.Otherwise, you can use a moonstone to evolve these Pokemon from previous generations while they are in Pokemon Black/White.Nidorina -> NidoqueenNidorino -> NidokingClefairy -> ClefableJigglypuff -> WigglytuffSkitty -> Delcatty