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You can teach it that in the battle frontier in HeartGold and SoulSilver OR breed it Sky Attack.
Some Pokemon can learn it regularly but since it used to be a TM it can be learned via move tutor though this move tutor isn't in ruby its in emerald and Pokemon xd gale of darkness so transfer any Pokemon you want to teach sky attack to to emerald or xd gale of darkness.
you can teach staraptor sky attack at the battle frontier, you can buy it with 64bp. this only works in Pokemon herat gold/soul silver
It cannot learn it. And that's that!
breed a female swellow or tailow with a male altaria that knows sky attack breed a female swellow or tailow with a male altaria that knows sky attack