You have to evolve a cascoon in order to get a Dustox. Either catch one in the wild, or evovle a Wurmple and pray it will turn into a cascoon. It'll be fairly quick, it evolves at level 10.
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You can find a dustox in eterna forest and there is also a trainer with dustox there too.
You are able to get Dustox by evolving Cascoon. Wurmple-Silcoon-Beautifly Wurmple-Cascoon-Dustox
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.
No, Dustox cannot learn HM02- Fly in Pokémon Emerald