Dustox is based on the Japanese Moon Moth, a species that is closely-related to and looks almost identical to the Luna Moth.There definitely needs to be a Pokémon based on the Luna Moth!
They're an absolutely gorgeous, green moth. Fairly large. They're mostly nocturnal, as far as I'm aware, and they're a pretty good size.
Personally, I'd make it a Bug/Dark type, part of a two or three evolution line, and would give it decent enough stats to make it useful in the main game's story. It could be named Lunoth.
However, Dustox is definitely lacking in the beauty department compared to the real thing. Shame it didn't get a Mega in ORAS that brought out more of these attractive features.
On the subject of moths, I'd love to see a Rosy Maple Moth Pokémon! They pretty much look like real-life Pokémon.
(I've already tried making one myself, as you can see in my avi.)