Munna is weak against Bug type pokemon, I suggest you get a flying, rock or a strong fire type Pokemon
isn't solosis only for Pokemon White? or you are using Pokemon White ?
I found it
I don't use Munna in battle, just for catching pokemon (putting them to sleep) But Dewott and Scraggy are at pretty high levels because they're the only ones I use for now, so I don't think it'll be too much of a problem.
And yeah, I have Pokemon White I didn't want that goth thing
Pokémon Global Link - Cool Hole
The Pokémon Global Link is now down and won't be open again until Thursday June 21st. However, in the posting of this, it has become known that the new Dream World area, Cool Hole, will not be accessible until June 23rd, the same date as Black 2 & White 2's Japanese launch. We currently don't know what Pokémon will be in the area, but we'll post as soon as we know.
Source: Serebii.net