I've found awesome success with a sleep talk set, ala milotic
Luvdisc @ Leftovers
Rest
Sleep Talk
Surf
Ice Beam
EV'ing it is hard. If you put special attack ev's into it you lose that tankishness that makes Luvdisc such a good choice for a bulky water.
Also with the gain of Lucky Chant this gen, you can stop your opponent from using the only strategy that is successful against Luvdisc, "Luck"
You could also go for a Rain Dance set, as Luvdisc seems like one of the best pokemon to do this with, with base 97 speed. It could be an unexpected move that turns the tide in the battle.