10 or 11
Silcoon and Cascoon.
Level 10.
Find a Wurmple, and evolve it into Silcoon. At level 10, it should be a Beautifly
Silcoon will evolve at a low level because bug Pokemon evolve quickly.
At level 10.
Level 10
Silcoon evolves into Beautifly at level 10
it evolves at level ten.
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.
Wurmple evolve into Silcoon/Cascoon at level 7. Then, Silcoon/Cascoon evolve into Beautifly/Dustox at level 10.
Wurmple evolves at level 7. Then depending on its personality it will either become silcoon or cascoon.
Silcoon evolves at Level 10.