Question

I know you use wurmple but I always get dustox.

Answer 1

Some wurmples turn in to silcoon, and some turn into cascoon. cascoon evolves into dustox. silcoon evolves into beautifly. its a 50/50 chance if your going to get a silcoon or cascoon

Answer 2

Beautifly. Go to the petalburg woods and walk around until you see a silcoon. then use an exp. share and level it up to lvl 10.

Answer 3

You may meet Silcoon at Petalburg Woods (10%)

Answer 4

I would suggests just catching a silcoon and then walking around with him (possibly holding a soothe bell or whatever it's called in that game) until he evolves by happiness to become Beutifly.