http://thpp.supersanctuary.net/wiki/Luna_ChildType:
Wind/
NatureAbility: Volt Absorb
Hp:65
Atk:55
Def:65
SpAtk:100
SpDef:65
Spd:130
If I were to chose 2 words to describe Luna Child those words would be "Glass Cannon". With 100 special attack, 130 speed, and a fantastic coverage move pool Luna can pull late game sweeps out of thin air. On the other hand... 65/65/65 Def stats give her the survivability of a peeps marshmallow treat in a microwave. So ya, Set.
Nasty LunaLuna Child @ Lum Berry/Leftovers/Ninja Outfit/Camouflage
Ability: Volt Absorb
Ev's: 252 SpAtk/ 252 Spd/ 4 Hp
Timid Nature (+Spd,-Atk)
-Nasty Plot
-Thunderbolt
-Nature Power/Giga Drain
-Poison Bomb/LUNATIC
Luna can come in on a resisted hit or the revenge kill and set up a nasty plot and go to town with her unresisted neutral coverage, 130 base speed means that very few puppets can out speed this frail little fairy while wind/nature typing grants Luna a much neutrality to all forms of priority but ice shard. Poison Bomb picks off Luna's long time treemates Star Sapphire and Sunny Milk along with the ever present D Kayuga while LUNATIC provides better overall super-effective coverage and can seriously dent even the mighty Sariel. Wind/Nature provide surprisingly decent Stab coverage, I prefer Nature Power over Giga Drain for the extra power (It hits a whopping 120 BP on both Sariel and Konngara allowing for a 67% shot at the easy 2 hit KO) since Luna REALLY cannot afford to take even neutral hits, however Giga Drain can provide a buffer against priority when facing offensive teams so its a case of whatever floats your boat I guess.
Options: Luna learns Mana charge and sub however...65/65/65 bulk tends to make both pretty bad. Luna does learn twister and can TRY to run this abomination...however no amount of EV tweaking will allow her to be consistent at it v.v.
Spoiler
Offensive Support
Luna Child @ Leftovers
Ability: Volt Absorb
Ev's 252 SpAtk/200 Hp/56 Spd
Timid Nature (+Spd,-Atk)
-Twister
-Nature Power
-Thunderbolt/Heal Bell
-Roost
With the given EV's Luna can outspeed fully invest +speed base 105's and OKHO's ASuwako, TToyo, AKiene and the Tenshi forms while gaining OK bulk. however she misses out on the 3 hit KO on full invested Spdef Suika, Restalk DLetty, and Tank TYuka so...meh.
Support: Luna really wants spikes and Luna reeeaaaly wants special walls gone, special wallbreakers such as AUtsuho, APatchy, and DAlice all make solid team mates while potent mixed hitters such as SFlandre, AKayuga, and Shingyoku-O can also clear the way. HEirin also makes a nifty teammate as she covers all of Luna's weaknesses while Luna gains free swap ins off of Volt Absorb.
Counters: Strong Special walls with a super effective or even neutral hit can shut Luna off entirely (D Mokou, Yoshika, Shingyoku-F, Offensive Ad Alice, Eirin, Lily White) while AdReisen, Youki and Mimi-Chan out speed and can OHKO the little Luna. Oh and our dark lord Ruukoto walls her entirely and can give a slow death by toxic. Also ice shard or strong priority can be used to revenge kill the little fairy.