Looks a lot like a normal type. Based on it's coloring and design, the only other possibility would be psychic or possibly ice, and we have both of those covered, so unless it's a new type, I'm going with normal.

Glaceon is also my favorite. I find Glaceon a lot cuter than the rest.

Glaceon is best eveeloution :3

I wanna see a dragon one though. Imagine the badassery of that

People are saying it's flying. Sylveon's name is similar to Slyph, a mythological creature associated with air. Also this;