Mega Altaria Offense

Altaria-Mega @ Altarianite
Ability: Natural Cure
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Return
- Earthquake
- Dragon Dance
- Roost

Mew @ Leftovers
Ability: Synchronize
EVs: 248 HP / 44 Def / 216 Spe
Bold Nature
IVs: 0 Atk
- Ice Beam
- Defog
- Will-O-Wisp
- Soft-Boiled

Keldeo-Resolute @ Choice Scarf
Ability: Justified
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
- Hydro Pump
- Secret Sword
- Scald
- Stone Edge

Heatran @ Leftovers
Ability: Flash Fire
EVs: 248 HP / 8 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Lava Plume
- Taunt
- Stealth Rock
- Earth Power

Landorus-Therian @ Flyinium Z
Ability: Intimidate
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Earthquake
- Fly
- Smack Down
- U-turn

Gengar @ Choice Specs
Ability: Cursed Body
EVs: 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Shadow Ball
- Sludge Wave
- Focus Blast
- Trick