Honestly, unless you're baton passing boosts from Scolipede, Baton Pass isn't a great strategy, especially when you have two very similar pokemon (Vaporeon + Sylveon). Passing acid armor boosts to help Sylveon set up and sweep is cool, but the Sylveon shouldn't have Wish/Baton Pass, as it won't be a good offensive pokemon. If your goal is to have an offensive Sylveon, use Calm Mind + 3 attacks. But, if you want to make a dual baton pass team, which isn't recommended, your set is good. Also, for EV's, you'd likely want to max out you defense and HP, and Sylveon's physical bulk is not good.