Diancie-Mega @ Diancite  
Ability: Magic Bounce  
EVs: 252 Atk / 4 SpA / 252 Spe  
Hasty Nature  
- Diamond Storm  
- Moonblast  
- Hidden Power [Ice]  
- Protect  

Genesect @ Choice Band  
Ability: Download  
Shiny: Yes  
EVs: 252 Atk / 4 SpD / 252 Spe  
Hasty Nature  
- U-turn  
- Iron Head  
- Extreme Speed  
- Blaze Kick  

Mew @ Safety Goggles  
Ability: Synchronize  
EVs: 252 HP / 4 Def / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Flamethrower  
- Snarl  
- Soft-Boiled  
- Will-O-Wisp  

Gastrodon @ Rocky Helmet  
Ability: Storm Drain  
EVs: 248 HP / 124 Def / 52 SpA / 84 SpD  
Bold Nature  
IVs: 0 Atk  
- Earth Power  
- Ice Beam  
- Recover  
- Toxic  

Thundurus @ Sitrus Berry  
Ability: Prankster  
Shiny: Yes  
EVs: 248 HP / 164 SpD / 96 Spe  
Timid Nature  
IVs: 0 Atk / 30 Def  
- Thunderbolt  
- Hidden Power [Ice]  
- Taunt  
- Thunder Wave  

always (Landorus-Therian) @ Rocky Helmet  
Ability: Intimidate  
EVs: 248 HP / 52 Def / 120 SpD / 88 Spe  
Calm Nature  
- Earthquake  
- Stone Edge  
- U-turn  
- Stealth Rock