It is a version exclusive for White, so you can not catch a wild one. In the Second Gym city you can trade a Cottonee for one, since it is trade you won't be able to name it, but it will get boosted exp.
Go to Nacrene City and there will be a house with stairs to the right of the Pokemon Center. Go into the house and there will be a girl upstairs and she will want a Cottonee for a Petilil.
In Pokemon Black, Petilil does not evolve by increasing its level. Instead, it evolves into a Liligant when you use a Sun Stone.
Tranfer it from a previous game. (Diamond, Pearl, Platinum, HeartGold, SoulSilver.)
Look in Pinwheel Forest.
Lost Lorn forest Pin Wheel forest
Pinwheel forest
You have to use a sun stone
In the Desert Resort
Level 64
To evolve petilil you have to use a sun stone.
Level 37
Level 28.
Level 31.
Sun stone.Of course its the same with COTTONEE,someone will be willing to give you a cottonee/petilil in that town...With leonora
Petilil evolves with a sun stone.
Petilil can evolve into Lilligant at any level because it requires a Sun Stone to evolve.
Petilil evolves with a Sun stone, not by level. You can get one in Nimbasa City, as well as in the Relic Castle. Hope it helps
Level 43
Level 64
To evolve Mantyke in pokemon black/white 2 you have to level it up with a remoraid in your party then it will evolve into mantine
Audino doesnt evolve in Pokemon black and white
Throh don't evolve in Pokemon Black and White.
watchog does not evolve
Level it to 41 and it will evolve
Virizion does not evolve.