Decent mega-kangaskan Dubers team

Arceus-Ghost @ Spooky Plate
Ability: Multitype
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Extreme Speed
- Shadow Claw
- Swords Dance
- Rock Slide

Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 208 HP / 252 SpA / 48 Spe
Modest Nature
IVs: 0 Atk / 30 SpA / 30 Spe
- Dazzling Gleam
- Hidden Power [Fire]
- Geomancy
- Hyper Voice

Kangaskhan-Mega @ Kangaskhanite
Ability: Parental Bond
Happiness: 0
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Fake Out
- Low Kick
- Frustration
- Crunch

Kyogre-Primal @ Blue Orb
Ability: Primordial Sea
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Origin Pulse
- Protect
- Ice Beam
- Thunder

Landorus @ Life Orb
Ability: Sheer Force
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk / 30 Def
- Earth Power
- Focus Blast
- Hidden Power [Ice]
- Grass Knot

Yveltal @ Life Orb
Ability: Dark Aura
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Dark Pulse
- Heat Wave
- Oblivion Wing
- Protect