Whether it will evolve into Beautifly or Dustox is nothing to do with nature. It is a simple 50/50 chance, determined when the Wurmple's egg is created.
Beautifly itself does not evolve, but if you have a Wurmple, it will evolve into either a Cascoon or a Silcoon at level 7 (something--nature, I think, determines which one it will evolve into). Silcoon will evolve into Beautifly at level 10 while Cascoon evolves into Dustox at the same level.
Silcoon will evolve into Beautifly.
beautifly
In beautifly....
no it does not evolve Silcoon reaches level 10, it will evolve into Beautiflywurmplesilcoonbeautifly
beatifly is the final evolved form, it doesn't evolve
Silcoon evolves into a Beautifly at level 10.
it evolves in to a beautifly in all the games
either silcooon or cascoon then beautifly or dustox
lv10, Cascoon evolve into Beautifly.
Silcoon evolves into Beautifly at level 10
caterpie dosen't evolve into beutifly, its last evolution is butterfree