Because dancing would make theses new episodes lamer than they already are. And dressing up the pokemon? No.
Hey, at least I like these episodes, true Dawn overdoes it, dresses in these fancy dresses that should be for proms and not contest. They should simple not so elaborate and fancy (like Dawn dressing up as Ash, simple but wierd as well, but hey at least it's simple)
They had dozens of nameless people entering, but somehow, May's worst appeals were more impressive than 90% of all of their's to the Judges.
Despite the fact that she had just learned to battle and used weak pokemon, she managed to beat all of them in battles that we don't get to see.
In the end, it's always May, her rival-of-the-day, and Jessie in a poor disguise in the finals. Their battles are usually full of crap worse than anything that other battlers get accused of constantly.
They were so messed up that nobody could take them as real competitions.