VGC16 this meta is broken

Kangaskhan-Mega @ Kangaskhanite
Ability: Scrappy
Level: 50
EVs: 4 HP / 172 Atk / 76 Def / 4 SpD / 252 Spe
Jolly Nature
- Fake Out
- Double-Edge
- Low Kick
- Sucker Punch

Thundurus @ Focus Sash
Ability: Prankster
Level: 50
EVs: 4 HP / 212 Def / 36 SpA / 4 SpD / 252 Spe
Timid Nature
- Thunderbolt
- Swagger
- Thunder Wave
- Sky Drop

Xerneas @ Power Herb
Ability: Fairy Aura
Level: 50
EVs: 60 HP / 36 Def / 156 SpA / 4 SpD / 252 Spe
Timid Nature
- Moonblast
- Dazzling Gleam
- Geomancy
- Protect

Groudon-Primal @ Red Orb
Ability: Desolate Land
Level: 50
EVs: 108 HP / 244 Atk / 156 SpD
Brave Nature
IVs: 0 Spe
- Precipice Blades
- Earth Power
- Overheat
- Protect

Cresselia @ Sitrus Berry
Ability: Levitate
Level: 50
EVs: 244 HP / 172 Def / 92 SpD
Sassy Nature
IVs: 0 Spe
- Ice Beam
- Gravity
- Helping Hand
- Trick Room

Smeargle @ Mental Herb
Ability: Own Tempo
Level: 50
EVs: 244 HP / 12 Def / 252 Spe
Timid Nature
IVs: 0 Atk
- Dark Void
- Sticky Web
- Transform
- Substitute