You are able to get Dustox by evolving Cascoon.
Wurmple-Silcoon-Beautifly
Wurmple-Cascoon-Dustox
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You can find a dustox in eterna forest and there is also a trainer with dustox there too.
Dustox can be found in Eterna Forest. it can also be found by battling these two bug catchers
I think that Team Galactic's members usually have Dustox.
I think it's Dustox
Believe it or not troipus is an evolution from DUSTOX you need a special evolvment stone that you will rarely find in Pokemon platinum [ i don't know where to find it ]