It does - to Servine at level 17 and Serperior at level 36.
snivy is not going to evolve
you evolve snivy by leveling it up to level 17.
Ash's Snivy didn't evolve yet.
snivy will evolve in this episode titled "full battle serperior vs snivy part 1
Snivy evolves at level 16
Snivy evolves into serperior
if snivy doesnt evolve at lv 17 you probobly pressed the b button
17 and 36! ;D
Probably.
Level 17
it has not yet been confirmed
At level 17, Snivy evolves into Servine.