he doesn't, whoever told you that dustox evolves, fails.
Dustox doesn't evolve.
Dustox doesn't evolve into any other Pokemon.
The Pokemon cascoon will evolve into Dustox at level 10 =D
10
same as dustox
Wurmple can go one of two ways, it can evolve into a Silcoon or a Cascoon. Silcoon evolve into Beautifly. On the other hand, Cascoon evolves into Dustox.
Cascoon evolves into Dustox.
at level 85
Dustox
Yes. It evolves into Dustox.
It evolves into Dustox.
the opposite of dustox i forget the name