Well, Ash is a Pokemon Trainer, so he cannot evolve. Unless you're talking about his Pikachu, which doesn't evolve.
Ash's Oshawott will not evolve.
No, Ash's Scraggy will not evolve.
Ash's Snivy didn't evolve yet.
No, Ash's bulbousaur does not evolve, but May's does.
Ash's doesn't have a dewott. He has an Oshwott, and it has yet to evolve.
ash's grotle will evolve in the battle againts Cynthia and the elite four
No,Ash's snivey wont evolve
BW074
yes
Not yet
Ash's Pikachu will not evolve because Pikachu chose to stay with Ash and gain more experience and in the episode that Ash had battled Lt. Surge Nurse Joy gave Ash a Thunderstone but pikachu don't want to evolve and Brock said that pikachu has more speed than Raichu
yes it does and it has.. but it is unknown if it will evolve into the last form most likely it will like all bird Pokemon ash captures