Moves: Stealth Rocks, Explosion, Earthquake, Stone Edge.
Item: Custap berry (for priority explosion)
which one goes better with this moveset?
Well, for both you are going to be using the same set so movepool variety doesn't matter that much here. Plus, it has better stats in every aspect except speed. Speed won't matter anyway because both are quite slow.
A great set would be:
Gigalith @ Custap Berry
EVs: 252 Hp/8 Atk/200 Def/48 Sp.def
-Rock Slide/Stone Edge
Hope this helps!