This is my personal favorite moveset for this Pokémon, and the one I use on my own Togekiss, Magic Egg.
Togekiss (M) @ Leftovers
Trait: Serene Grace
EVs: 252 SpAtk / 96 Speed / 80 Defense / 80 HP
Nature: Timid (+Speed -Atk)
-Timid is a good nature because Togekiss could use some extra speed, and Atk means absolutely nothing to a SpAtk beast like Togekiss.
-Dazzling Gleam: (Type: Fairy / Power: 80 / Accuracy: 100) Decent coverage, I suppose, but STAB is what we want here.
However, if you are pre-generation six, Shadow Ball can be substituted for Dazzling Gleam.
-Shadow Ball: (Type: Ghost / Power: 90 / Accuracy: 100) Fair chance of lowering SpDef, making Togekiss even more of a threat. Again, decent coverage, but that's not what we want with this move.
-Air Slash: (Type: Flying / Power:75 / Accuracy: 95) Let's take advantage of Serene Grace, shall we? STAB + 60% Flinch Chance. Nothing more needs to be said.
-Aura Sphere: (Type: Fighting / Power: 80 / Accuracy: Can't miss) Now, for all you type advantage people, behold aura sphere! Covers Ice, Rock, and Steel (Gen VI) weakness, along with dark and normal. Also never misses. If that isn't extreme coverage, what is?
-Psyshock: (Type: Psychic / Power: 80 / Accuracy: 100) A counter to counter a counter. Confused? In the. Case that Togekiss is up against a Pokémon with high SpDef (which typically has low Def) Psyshock is based on the user's SpAtk and the target's Def stats.
I hope this helps you as much as it helps Magic Egg and I, thanks for reading my first ever post!