Early Game:
* Route 201: This is your first encounter with Wingull, and they are relatively common here.
* Route 204: You can find them flying around here as well.
Later Game:
* Route 218: They are still present here, though less common than earlier routes.
* Route 219: They're more common on this route than in the previous two.
* Route 220: Another location where they're relatively frequent.
Remember: Wingull is a Water/Flying type Pokemon, so be prepared to counter its Flying attacks with Electric or Rock moves, and its Water attacks with Grass or Electric moves.