Mega Altaria

Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 252 HP / 212 Def / 44 Spe
Impish Nature
- Stealth Rock
- Earthquake
- Hidden Power [Ice]
- Knock Off

Mew @ Leftovers
Ability: Synchronize
Shiny: Yes
EVs: 248 HP / 148 Def / 48 SpD / 64 Spe
Bold Nature
IVs: 0 Atk
- Will-O-Wisp
- Psychic
- Defog
- Soft-Boiled

Tapu Bulu @ Grassium Z
Ability: Grassy Surge
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Swords Dance
- Horn Leech
- Wood Hammer
- Superpower

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

Magnezone @ Assault Vest
Ability: Magnet Pull
EVs: 112 HP / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Flash Cannon
- Hidden Power [Fire]
- Volt Switch

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