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It is Level 25 in all the games :)
I use this site to help me find out what I need to about my pokemon- it tells you what levels they learn certain moves and so on, as well as how they evolve: http://funadvice.com/r/153e005faf3
Ok according to my 10th anniversary complete pokedex book wingull evolves into Pelipper at level 25. hope it helped