NFE PhysDef Wall (Gloom) @ Eviolite
Ability: Stench
EVs: 252 HP / 252 Def / 4 Spe
Bold Nature
IVs: 0 Atk
- Strength Sap
- Sleep Powder / Moonblast
- Sludge Bomb
- Giga Drain / Moonblast
Optional Move(s): 
- Hidden Power [Fire]
- Moonlight
- Stun Spore
- Toxic
- Worry Seed
Optional Item(s): 
- N/A
Optional Ability: 
- N/A
Optional EV/IV(s): 
- N/A
Overview: Gloom is a reasonably good physically defensive wall in the metagame, thanks to Strength Sap and its good defensive stats. However, it faces heavy competition from the likes of Servine, Roselia, Ferroseed, and Quilladin as a defensive Grass-type, which limits its viability. Additionally, it cannot wall Sliggoo, Pawniard, and Klang due to their abilities. 
PhysDef Wall: Physically defensive Gloom can wall physical threats such as Alolan Grimer, Machoke, Fraxure, Krokorok, and Hakamo-o. Gloom's main niche is Strength Sap, which lets it recover HP equal to the opposing Pokemon’s Attack stat, while also lowering their Attack by one stage. Sleep Powder forces switches and prevents Pokemon such as Pawniard and Klang from setting up on Gloom. Sludge Bomb is a STAB attack which does decent damage to Fairy- and Grass-types like Servine, Togetic, and Tangela. Giga Drain hits Ground- and Water-types such as Marshtomp, Prinplup, Krokorok, and Croconaw hard. Moonblast can be used over Sleep Powder or Giga Drain to hit Dragon- and Fighting-types such as Machoke, Fraxure, and Hakamo-o for super effective damage.
Checks and Counters: Specially defensive Grass-types like Roselia, Ferroseed, and Quilladin can easily switch into all four of Gloom’s attacks and take advantage of it by setting up Spikes. Sliggoo can also set up on Gloom easily thanks to Sap Sipper. Gloom also suffers from the fact that Strength Sap is an unreliable form of recovery as it recovers less and less the more it is used on the same Pokemon. If a Pokemon on the enemy team is already asleep, Duosion, Pawniard, and Klang can use Gloom as a chance to set up. Offensive special Fire-types like Monferno, Combusken, and Magmar threaten Gloom out with their strong Fire-type STAB attacks but they do not appreciate switching into Sludge Bomb. Kadabra hits Gloom very hard with Psychic. Haunter can avoid Sleep Powder with Substitute, cripple Gloom with Will-O-Wisp, and then hit it with a boosted Hex.