Pretty much any Pokemon with wings, i don't know them all but i can make a list of ones i know:
pidgey Venomoth
spearow Pidgeot
butterfree Pidgeoto
beedrill *maybe Scyther*not sure*
fearow
farfetch`d
Ho-oh
lugia
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no
No, beedrill can not learn fly. The only HM it can learn is fly.
No, beautifly cannot learn fly.
Yes Sigilyph can learn fly
No, Butterfree cannot learn Fly.