who is he
Just remember Doduo/drio, Gyarados, the Hoppip line, Mantine/tyke, Tropius, Rayquaza, Drifloon/blim, Fan Rotom, Sky Shaymin, Incarnate Tornadus, and both formes of Thunderus and Landorus--wings aren't necessary for a Flying-type if it makes sense otherwise.
We could very well see Sylveon use its ribbons as wings, ha ha! x3
And I like the idea of birds laying eggs + Sylveon being in an egg shape.