Stark (Gigalith) @ Rockium Z
Ability: Sand Stream
Level: 50
EVs: 252 HP / 188 Atk / 68 Def
Brave Nature
- Protect
- Stone Edge
- Earthquake
- Rock Slide / Wide Guard
Marowak-Alola @ Thick Club
Ability: Lightning Rod
Level: 50
EVs: 252 HP / 188 Atk / 68 SpD
Brave Nature
IVs: 0 Spe
- Protect
- Shadow Bone
- Flare Blitz
- Swords Dance
Although the two are very slow, with help from Trick Room, these two can win the game in the four turns you have to use it. Gigalith's spread makes it so Adamant Tapu Bulu has a 6.5% chance to OHKO it with a Horn Leech in Grassy Terrain. The Attack lets it OHKO 252 HP / 4 Def Marowak with Stone Edge 100% of the time. With the 1.5x Sp. Def boost and the already high defenses, Gigalith becomes a complete tank. Gigalith, being the second slowest weather setter (to Torkoal), is the perfect counter to any weather (barring Sun). It has no problem taking care of Ninetales or Pelipper. It effectively OHKOs 252 HP Gyarados with Continental Crush from Stone Edge at -1. This protects Marowak so it can hit a partner or even set up a Swords Dance.
However, Gigalith has a fair share of weaknesses. These include Celesteela, Tapu Bulu, Magnezone, Tapu Lele, Araquanid, etc. Marowak, however, has a great matchup with Steel and Grass types. Marowak's spread allows it to survive Modest LO Tapu Lele's Psychic in a terrain that isn't Psychic Terrain. Marowak can easily clean up any Steel Pokemon with a Flare Blitz. It also redirects Electric attacks, in case your opponent is trying to chunk Gigalith with a Thunderbolt. It also one shots Lele which allows Gigalith to sweep through unprepared teams more soundly.
Although they do share two weaknesses (Water and Ground), this is compensated by a couple teammates. Good partners include Tapu Bulu, Celesteela, Oranguru, P2, Gyarados, Tapu Koko, Magnezone, among others. If you have any questions or suggestions, please tag me or PM me if you would like. Thanks! :)