Here's My Gigalith, with some awesome sacrificing strategy combo:
Item: Custap Berry
EVs: 252 Atk 252 HP 4 Def
-Stone Edge STAB
-Earthquake Coverage, compliments with Stone Edge as the Edgequake Combo
-Explosion The Final Kaboom when down to just (25%) or even 1 HP for sweet revenge when Custap Berry is Used
-Curse Boosts Atk. & Def at the expense of Speed
Okay, so this set is the bomb, literally, So you have Stone Edge and Earthquake, practically the best Combo to beat a lot of different types, and you have Curse to boost your Attack and Defense, and let's not forget, Explosion, the Revenge Kill that can actually work by using Custap Berry which lets Gigalith move (regardless of Speed), so it can take down an opponent to make the item worth using as a great sacrificing strategy.