Gen 6 Mega Tyranitar

Tyranitar @ Tyranitarite
Ability: Sand Stream
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Dragon Dance
- Stone Edge
- Crunch
- Fire Punch

Gengar @ Life Orb
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Shadow Ball
- Sludge Wave
- Focus Blast
- Icy Wind

Landorus-Therian @ Leftovers
Ability: Intimidate
EVs: 252 HP / 240 Def / 8 SpD / 8 Spe
Impish Nature
- Earthquake
- U-turn
- Stealth Rock
- Knock Off

Klefki @ Leftovers
Ability: Prankster
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Spikes
- Thunder Wave
- Play Rough
- Toxic

Serperior @ Life Orb
Ability: Contrary
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hidden Power [Ice]
- Leaf Storm
- Dragon Pulse
- Giga Drain

Keldeo-Resolute @ Choice Scarf
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hydro Pump
- Secret Sword
- Icy Wind
- Hidden Power [Poison]