First you need to be able to access the Daycare Centre which is on the route between Wellspring Cave and Straiton.
Snivy is in the Field/Grass groups so there are large variety Pokemon it can breed with, especially with Ditto (which 99% of Pokemon can breed with the exclusions being Legendaries and Nidoqueen)
ditto
36
No, it is only in Pokemon Black/White/Black 2/White 2.
NO
Snivey evolves into Servine at Lv. 17.
You can't, you have to choose it as your starter. this is the same for Tepig and Oshawatt.
Get someone to breed one on their version, and trade it to you.
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
Level 17.
Tepig evolves into Pignite Into Emboar and snivey evolves into servine into serperior and oshawott evolves into dewott into daikenki
FU**In SNIVEY