Well, Drilbur evolves into Excadrill at level 31. So, you have to train Drilbur until he reaches level 31 and evolves on his own. Sadly, they don't make a stone to evolve Drilbur at the moment. (Since he is a Ground-Type). The only other thing you may be able to do is see if you can find a Drilbur to trade with one of your Pokemon. He will possibly evolve during the process.
Sincerely, gurlgamer
Weavile does not evolve in Pokemon Black.
All the starters evolve in Pokemon Black. Many other Pokemon evolve as well.
Throh don't evolve in Pokemon Black and White.
Audino doesnt evolve in Pokemon black and white
lampent evolve litwick
no it does not evolve on Pokemon black or white
No, Heatmor does not evolve.
It doesn't evolve
Durant does not evolve.
Maractus does not evolve.
No, Cryogonal does not evolve in pokemon black and white
Raticate can not evolve, it is a fully evolved pokemon.