Guys' prom shoes are kinda gross.
You know those weird tux rental shoes that are like pointy and have almost no sole? Also the generalized idea of shoe rental is seems more appropriate for the bowling alley than a formal dance, no?
Anyway, there are options! These patent leather Chuck hi-tops aren't hard to find (here's a link... they're all over the Internet and probably the stores, too). I also saw a pair of black patent Vans slip-ons (covet, covet), but it was someone selling them used.
Actually... a girl could rock something like that with her dress, if that's her style and she's feeling saucy. And she wants to actually dance instead of teeter around getting blisters.
It's your prom; wear what you want, right?