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I think I'm going to post an unpopular opinion, but
Regional birds got tired after gen 2. First, you have Pidgey, it needed to exist. Then Hoothoot was there to show how the day/night mechanic works. And then you got a 'regional' Pidgey. It's the same pokemon with different base stats. At least Talonflame got a different type and Corviknight works as a taxi, but the others have nothing special.