Snivey evolves into Servine at Lv. 17.
Level 17.
ditto
No, it is only in Pokemon Black/White/Black 2/White 2.
The only way to find a Snivy is to get it from the starter Pokemon. If not, then you'll have to get it over the Global Trade.
Snivey
You can't catch a Snivy in the wild, but you can transfer it from Black and White or take a chance and try to get one on the GTS
Tepig evolves into Pignite Into Emboar and snivey evolves into servine into serperior and oshawott evolves into dewott into daikenki
In Pokemon White... Zoroark evolves from Zorua at Level 30... ^_^
Level 5
In my opinion, Tepig would be the best starter to choose in Pokemon Black and White 2.
level 31
Emolga does not evolve. I played Pokemon White also and it does not evolve. Some Pokemon do but this one does not evolve.