woobats do not evolve dependent on level in pokemon black or white. you must evolve woobat by leveling it up with high friendship. i recomend putting it in the pokemon musical, using battle items on it, using it in battle, and have it hold the item soothe bell.
Level 16+
level 21
Servine evolves at level 39 into Serpiorior.
Kadabra evolves to Alakazam when traded
yes. level it up with high friendship
It will evolve when it learns Double Hit, which the Pokemon will learn at level 32. So, level it up to level 32.
Never
Yes, it does if it's at its evolution level (e.g. a level 54 Dragonair getting fed a Rare Candy WILL evolve into a Dragonite). I know this from firsthand experience.
by a fire stone
by a fire stone
Pikachu and evee are two.
no. although tauros is a basic pokemon, it doesn't evolve.