Sawsbuck is the final evolution of Deerling. Sawsbuck doesn't evolve.
you must trade gurdurr for it to evolve
if you levek your Ekans up to level 22 it will evolve into a Arbok.
Well go to a pet shop. And then, you have to look for someone with a ! above there head. When you find one, complete the quest that they assigned you to. Then you should get stars. Stars are items that help you levek up on your pet trainer job. Once you get a certain amount of stars you will have gotten to the next level!