It doesent evolve through levels, it will only evolve to jigglypuff through high friendship, use a moon stone on the jigglypuff to evolve it to wiglytuff.
in platinum what leve does staravia evole
Igglybuff evolves when it is happy and when it gains a level at the same time.
at level 36
level 1
level 40
Level. 2
level 14
at level 48
Level 24
It evolves at level 42.
level 28 or level 29
level 20