[OU] Mega Metagross Tangrowth offense

Tangrowth @ Rocky Helmet
Ability: Regenerator
EVs: 244 HP / 216 Def / 48 SpD
Relaxed Nature
- Sleep Powder
- Leech Seed
- Giga Drain
- Knock Off

Keldeo @ Choice Specs
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hydro Pump
- Secret Sword
- Scald
- Icy Wind

Tyranitar @ Choice Band
Ability: Sand Stream
EVs: 100 HP / 252 Atk / 156 Spe
Adamant Nature
- Stone Edge
- Crunch
- Pursuit
- Superpower

Metagross-Mega @ Metagrossite
Ability: Clear Body
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Meteor Mash
- Zen Headbutt
- Ice Punch
- Hammer Arm

Heatran @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Lava Plume
- Earth Power
- Taunt
- Stealth Rock

Tornadus-Therian @ Assault Vest
Ability: Regenerator
EVs: 248 HP / 8 SpA / 252 Spe
Timid Nature
- Hurricane
- Knock Off
- U-turn
- Heat Wave