Not sure if this esoteric ball knowledge is already known but I’ve had a galarian bird spawn 3 days in a row by using the daily incense while following a route. Rare(er) pokemon tend to spawn at the end of a route and I believe it’s the same when there’s not much time left for the daily incense. If you reach the end of the route when the incense only has 2 minutes or less left, I think the spawn rate for the birds goes up significantly.
Side note: hit that pathetic little 145CP zapdos with an ultra ball curveball excellent throw after golden razzing it and it escaped and left. Thank you Niantic!
by shawnflarpus