use the lucky egg
krookodile evolves at level 40 in Pokemon black and white
Klink evolves into Klang at level 38 on Pokemon Black.
futachimaru evolves at level 99 in Pokemon black and wight
Level 64
Level 43
Level 5
krookdile evolves at level 40 on both Pokemon black and white
Roggenrola evolves at level 25 into Boldore on Pokemon Black.
the only level one pokemon you can get is pokemon from eggs.
In Pokemon Black AND White, Dewott evolves at level 36. Hope this helps!
Archen evolves into Archopes at level 37 in Pokemon Black, hope this helps :)
Shelgon evolves into Salamence at level 50 in Pokemon black 2.