Yeah I haven't touched my Nintendogs in a while either. ;o; Poor little guys. I had this one Shiba Inu named Diogi (get it? D-O-G I felt so clever after that one lol), best virtual dog I ever had.
Ew, yeah, no Dakota then. We can't have that. I think a short, classy name with small ties to the metaphysical would be good for a Pokemon like Sylveon. Like, Athena or Sestra.
Oh! Or you could go with something about Sylveon's color pallet, like Sorbet (I think I may take that one tbh :x).