Gigalith

In a tier filled with Rock-types, Gigalith struggles to stand out. Gigalith often finds itself as a Custap lead that sets up Stealth Rock and then finishes with an attack. Its sole Rock typing makes it outclassed offensively by Golem and defensively by Regirock. A stronger Rock Blast and Explosion might make it seem better than Golem, but Golem gets STAB on Earthquake and an Electric-type immunity, which makes it better overall. Gigalith's main selling point is Sturdy, which lets it almost always survive a hit and set up Stealth Rock. Also, great offensive presence and a powerful Explosion are good reasons to choose Gigalith if you need a suicide lead.