Heck

Mawile-Mega @ Mawilite
Ability: Intimidate
EVs: 40 HP / 252 Atk / 216 Spe
Adamant Nature
- Swords Dance
- Play Rough
- Sucker Punch
- Knock Off

Hoopa-Unbound @ Choice Scarf
Ability: Magician
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Dark Pulse
- Psychic
- Focus Blast
- Trick

Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 252 HP / 216 Def / 24 SpD / 16 Spe
Impish Nature
- Stealth Rock
- Earthquake
- Stone Edge
- U-turn

Magearna @ Assault Vest
Ability: Soul-Heart
EVs: 200 HP / 56 SpA / 252 SpD
Calm Nature
IVs: 1 Atk
- Fleur Cannon
- Flash Cannon
- Hidden Power [Fire]
- Volt Switch

Salamence @ Flyinium Z
Ability: Moxie
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Dragon Dance
- Fly
- Dragon Claw
- Earthquake

Keldeo @ Choice Specs
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Scald
- Hydro Pump
- Secret Sword
- Icy Wind