A calm mind set could be pretty cool with what it has now.
Lunala
Timid
Shadow Shield
Leftovers
4 HP/ 252 Sp.Atk/ 252 Spd
Moongeist Beam
Moonblast
Calm Mind
WoW/Roost-Moonlight
MG Beam for STAB, Moonblast to threaten dark types that might want to swap in, Calm mind for set up, and Will-o-wisp...