surprise

Mew @ Expert Belt
Ability: Synchronize
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Ice Beam
- Fire Blast
- Earth Power
- Giga Drain

Gyarados-Mega @ Gyaradosite
Ability: Moxie
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Earthquake
- Waterfall
- Crunch
- Dragon Dance

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

Klefki @ Leftovers
Ability: Prankster
EVs: 252 HP / 216 Def / 40 SpD
Bold Nature
- Spikes
- Thunder Wave
- Foul Play
- Magnet Rise

Skarmory @ Leftovers
Ability: Sturdy
EVs: 252 HP / 184 Def / 72 SpD
Bold Nature
- Roost
- Whirlwind
- Stealth Rock
- Counter

Latios @ Life Orb
Ability: Levitate
EVs: 248 SpA / 8 SpD / 252 Spe
Timid Nature
- Defog
- Recover
- Draco Meteor
- Earthquake