Haha, no worries there. And if you think about it, I couldn't come up with a better spread for Sylveon (maybe swap the Defense and SpD, idk). It's bulky enough to take some hits and is still strong enough to strike back. We've all seen how useful Vaporeon has been over the years. Take for example the following set:
Sylveon@Leftovers
Bold; 252 HP / 240 Def / 16 SpD
Wish
Protect
Moon Blast
Filler / Coverage
Now it's too early to speculate on Sylveon's movepool and whatnot but we know for sure it has access to these two moves and have very strong evidence for the above spread being the correct one in terms of base stats. This EV spread would leave sylveon with 394 HP / 140 Atk / 237 Def / 256 SpA / 300 SpD / 166 Spe. To give an idea of its bulk:
252 LO Latios' Psyshock vs. 252/240+ Sylveon: (42.89% - 50.51%)
252 LO Thundurus-T's Thunderbolt vs. 252/16 Sylveon: (43.65% - 51.78%)
252 LO Alakazam's Psychic vs. 252 / 16 Sylveon: (39.09% - 46.45%)
252 Scarf Terrakion's Stone Edge: (41.37% - 48.98%)
252+ CB Dragonite's Rain Waterfall vs. 252 / 240 Sylveon: (55.58% - 65.48%)
As we see here, Sylveon is decently capable of handling Alakazam, Latios, and possibly even Thundurus-T in a pinch on the special side. Physically, it doesn't have stellar bulk but can stand up to CB Dragonite's best attack against it, for example, and has comparable physical bulk to specially defensive Celebi. If you wanted to, you could always just relegate Sylveon to SpD, where it does weird shit like avoiding the 2HKO from Thundurus-T's LO Thunder over 75% of the time, assuming Max/Max.
It's offensively no slouch, either. Assuming 95 BP for Moonblast, it can occasionally OHKO Latios after a round of LO and SR, which is decent. You could probably get away with running Max HP / Max SpA if you wanted to run offensive Sylveon but that's probably better left to others.
Again, Gen 6 will obviously be different, but odds are these pokemon will remain in OU/viable, so it's good to have an idea of what it would take to stand up to them.