Gotta Go Fast ubers

Darkrai @ Life Orb
Ability: Bad Dreams
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Dark Void
- Dark Pulse
- Nasty Plot
- Sludge Bomb

Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 184 HP / 28 Def / 252 SpA / 44 Spe
Modest Nature
- Moonblast
- Substitute
- Geomancy
- Thunder

Shaymin-Sky @ Life Orb
Ability: Serene Grace
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Air Slash
- Seed Flare
- Healing Wish
- Hidden Power [Ice]

Deoxys-Speed @ Light Clay
Ability: Pressure
EVs: 248 HP / 8 Atk / 252 Spe
Jolly Nature
- Reflect
- Light Screen
- Stealth Rock
- Knock Off

Arceus @ Lum Berry
Ability: Multitype
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Extreme Speed
- Swords Dance
- Earthquake
- Recover

Salamence @ Salamencite
Ability: Intimidate
EVs: 80 HP / 252 Atk / 176 Spe
Adamant Nature
- Dragon Dance
- Return
- Roost
- Earthquake