Depends on your definition of good, but here's a list:
Anyways, I know you can catch a Ducklett, but that really won't help for too long. Braviary if you get White 2, Therian Forme Tornadus if you use Dream Radar, Zubat, Woobat, Mandibuzz if you get Black 2, Archen, Combee, Emolga, Skarmory, Drifloon, Pelipper, Gligar, Mantyke, Swablu, Delibird (lol), Yanma, and Tropius --- Official Lugia of the Pokemon BW2 Boards
Don't even consider Tropius, it's post E4, I personnaly am using Crobat and Flygon, which isn't of the Flying type, but if you just need someone to use Fly like me then Flygon works fine. --- Yanmega use Fly! Wait, what do you mean you can't?