Considering that both Pidgey and Spearow are of this mold, half of the Normal/Flying early-game birds are two-stagers and half are three-stagers. So, yeah, kinda hard to pinpoint.
I believe you mean Tailow, not Pidgey. Pidgey has Pidgeotto and Pigeot. Tailow only has Swellow. Also, don't forget Hootoot.
The "mold" was "early-game birds", genius. Pidgey, Spearow, Hoothoot, Taillow, Starly, and Pidove (and probably, but not certainly, Fletchling) are all the mold I was talking about. Hence why I then said that half are two-stagers and half are three. If I was only talking about the two-stagers, then the later part of that would have made no sense.
Creator of Jay's Journey (see quote!) "It's not ten years old! Therefore, it sucks!" - Nostalgia whores everywhere