Ah, Excadrill, One of my favorite Pokemon!
Nature: Adamant (+Atk -Sp. Atk)
Ability: Sand rush
EVs: 252 HP / 252 Atk / 4 Speed
Poison Jab: Poison jab has good power, Takes out Grass types and Fairy types AND has a 30% chance of Poisoning the opponent!,
-Earthquake: GREAT power and its a STAB move,.
-Metal Claw: STAB move and takes care of Ice types, rock types and fairy types, plus it has a 10% chance of Raising your Atk by 6+!.
-Rock Slide/Swords dance: Rock slide for flying types, bug types, ice types and fire types, Or you can go for swords dance, which sharply raises your attack!
Well thats what I have for excadrill, hope this moveset helps.