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Charges up turn one, and then attacks turn two.
Like all moves that take a turn to charge up, Sky Attack is not a good competitive move. In fact, Sky Attack is probably the worst of the charge-up moves, due to the fact that it does not allow the user to avoid most attacks, meaning it will most likely take a large hit while Sky Attack is charging. Sky Attack's imperfect accuracy also presents a problem, as it will sometimes give the opponent two free turns instead of one. Like all charge-up moves, Sky Attack allows the opponent to easily switch to a counter that can easily absorb the Sky Attack, giving the opponent momentum. Do not use this move.
Drill Peck is a much less powerful option, but only takes one turn to execute.