Well it really depends on the nature, lv, moves, and health, attack, defence ect. and it might also depend on the Pokemon it will be battling.
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Wingull evolves at lv25 into Pelipper
Yes.
Try to surf you may find it
In one of the treehouses in Fortree City is a man with a Wingull. Talk to the Wingull, and it will fly off out of the treehouse. When you get to Mossdeep City, you will see a person with a Wingull. Talk to it and it will fly off as well. Then go back to Fortree City and into the treehouse where you talked to the first Wingull. Talk to the man next to the Wingull, and he will give you the Mental Herb, and item which is a hold item that prevents attraction on the Pokemon that is holding it.
Migrate from R/S/E or trade with D/P/Pt. Also, if you listen to Mary and Prof. Oak's radio talk show, sometimes Mary will announce that swarm of a certain Pokemon has appeared. Wingull are one of those Pokemon.