I've been trying a makeshift set of
Sylveon Lefties 252 HP, 4 Def, 252 Spe, Timid, Wish, Sub, Moonblast, HP Ground. It gets good bulk, but all it can set up is a sub or pass wishes. HP ground is good coverage for it, so it can get away with a tank set with 2 attacks. Still working on the right...