Staravia seems to be the weakest, but when he evolves, he'll be strong.
Sadly, i'm gonna have to say after Staravia evolves, Noctowl will be the weakest.
It goes in this order of strength, the last being the weakest.
I like Noctowl.
I was thinking of putting Swellow in the second part, since he withstood lots of lighting. But, I decided that Staraptor would defeat him in combat.