Mega latias

Latias @ Latiasite
Ability: Levitate
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Stored Power
- Recover
- Thunderbolt

Gastrodon-East @ Leftovers
Ability: Storm Drain
EVs: 252 HP / 4 Def / 252 SpD
Sassy Nature
- Scald
- Recover
- Toxic
- Earthquake

Magearna @ Assault Vest
Ability: Soul-Heart
EVs: 248 HP / 8 SpA / 252 SpD
Sassy Nature
IVs: 0 Spe
- Fleur Cannon
- Iron Head
- Hidden Power [Fire]
- Volt Switch

Greninja-Ash @ Choice Specs
Ability: Battle Bond
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hydro Pump
- Dark Pulse
- Water Shuriken
- U-turn

Kartana @ Fightinium Z
Ability: Beast Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Leaf Blade
- Sacred Sword
- Defog

Landorus-Therian @ Choice Scarf
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Stealth Rock
- Stone Edge
- U-turn