Giratina Offense

Deoxys-Attack @ Life Orb
Ability: Pressure
EVs: 4 Atk / 252 SpA / 252 Spe
Rash Nature
- Psycho Boost
- Ice Beam
- Superpower
- Extreme Speed

Magearna @ Assault Vest
Ability: Soul-Heart
EVs: 248 HP / 252 SpA / 8 SpD
Modest Nature
IVs: 0 Atk
- Fleur Cannon
- Volt Switch
- Aura Sphere
- Flash Cannon

Arceus @ Life Orb
Ability: Multitype
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Extreme Speed
- Earthquake
- Shadow Claw

Salamence @ Salamencite
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Dragon Dance
- Return
- Earthquake
- Outrage

Groudon @ Red Orb
Ability: Drought
EVs: 248 HP / 8 Def / 252 SpD
Careful Nature
- Stealth Rock
- Precipice Blades
- Roar
- Lava Plume

Giratina @ Leftovers
Ability: Pressure
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
- Will-O-Wisp
- Roar
- Rest
- Sleep Talk