Pidgeotto- Decent teammate who rarely was used in important battles. Noctowl- Decent teammate who rarely was used in important battles. Swellow- Decent teammate who actually had a surprisingly high winning record (he's only lost a very few battles, one to Latios), he must be pretty strong. Staraptor- Decent teammate who had a losing streak after evolving Unfezant- Played second fiddle to all the Unova starters (I didn't see her in many episodes) Fletching- Too early to tell.
Basically, the regional birds tend to be alright teammates who have their fair share of battles and wins, but are generally overlooked by the plot in favor of featuring more on the starters (Charizard, Bayleaf, Sceptile, Infernape, and Oshawott/Pignite/Snivy all took center stage). Of them, Staraptor is the most physically intimidating, but Swellow has had the most successful battles.
3DS FC: 4596 9948 4995 (Fighting Safari with Machoke, Throh, and Riolu) Shiny Value: 695 (PM me to hatch your shiny- I won't ask for anything in return!)