Mega Altaria Balance

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
- Soft-Boiled
- Will-O-Wisp
- Stealth Rock

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

Marowak-Alola @ Thick Club
Ability: Lightning Rod
EVs: 252 Atk / 252 Spe
Adamant Nature
- Shadow Bone
- Fire Punch
- Earthquake
- Swords Dance

Excadrill @ Leftovers
Ability: Mold Breaker
EVs: 248 HP / 244 SpD / 16 Spe
Careful Nature
- Earthquake
- Iron Head
- Rapid Spin
- Toxic

Greninja @ Focus Sash
Ability: Protean
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Spikes
- Ice Beam
- Toxic Spikes
- U-turn