Diggersby @ Life Orb  
Ability: Huge Power  
EVs: 252 Atk / 4 Def / 252 Spe  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Precipice Blades  
- Knock Off
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Optional Move(s):
- Swords Dance
- Fire Punch
- U-turn
Optional Item(s):
- Protective Pads
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Overview:
Diggersby's Huge Power ability allows its to boost its Attack equivalent to those with 180 Atk stats, and combined with STAB priority in Fake Out and Extreme Speed, turns it into a most strongest priority user available, letting it revenge kill sweepers such as Xerneas and suicuide leads such as Deoxys-Speed. Unfortunately, Diggersby is quite slow outside of its priority, it is often forced out by a lot of faster pokemon that can avoid a OHKO from Extreme Speed. It is also frail, making it harder to bring in safely.