NFE SpDef Wall (Natu) @ Eviolite  
Ability: Magic Bounce  
EVs: 248 HP / 8 Def / 252 SpD  
Careful Nature  
IVs: 0 Atk  
- Night Shade
- Roost  
- U-turn / Toxic / Protect
- Protect / Refresh 
Optional Move(s):
- Calm Mind
- Heat Wave
- Psychic
- Psyshock
- Thunder Wave
Optional Item(s):  
- N/A
Optional Ability:  
- N/A
Optional EV/IV(s): 
- 80 HP / 252 Def / 176 Spe (Bold)
Overview: Blessed with an amazing ability in Magic Bounce, Natu is able to bounce entry hazards for its teammates and deal with common Spikers, Roselia and Ferroseed. It acts as a reasonable hazard deterrent with just its ability alone and often makes any opponent think twice before clicking a status or hazard-setting move. However, its poor defenses, even when invested, and defensive typing means it struggles to switch into some Stealth Rock users, such as Pawniard and Krokorok. Due to its passive nature, Pokemon with boosting moves are able to use Natu as setup bait. 
SpDef Wall: The investment in Special Defense and HP allows Natu to be a very reliable check to special attackers, especially Roselia, with Magic Bounce to stop Roselia setting up Spikes. Night Shade allows Natu to deal some damage and chip Pokemon despite being passive. Roost gives Natu important longevity, making it more reliable as a check to special threats and allowing it to come in multiple times to bounce back hazards. Protect allows Natu to scout moves, and more importantly stall PP, especially against Roselia since Synthesis has a lower PP than Roost. Protect also synergises well with Toxic as a way to reliably accumulate chip damage. U-turn can be used instead to keep momentum once Natu has pressured the opponent to not use any targeted status moves. Refresh further boosts Natu's longevity, cleansing status from Scald burns and Sludge Bomb poison. 
Checks and Counters: Natu is very passive, meaning that bulky setup sweepers with reliable recovery, such as Clefairy, Duosion, and Klang, can set up on it and aren't affected by the occasional Toxic. Dark-types such as Alolan Grimer and Pawniard can easily switch into Natu and threaten it with Knock Off or Pursuit trap it, ensuring that it cannot act as a hazard deterrent. The most common Natu set cannot hit Normal-types such as Staravia and Munchlax, due to its only offensive move being Night Shade. 
Optional EV/IV(s): An alternative spread of 80 HP / 252 Def / 176 Spe with a Bold Nature can be used for the offensive Calm Mind, Psyshock, Heat Wave, and Roost set. This set still acts as a hazard deterrent and also gives Natu some offensive presence. This set sets up on Pokemon such as Roselia and Calm Mind Clefairy, but also can switch into defensive physical Stealth Rock setters such as Metang and Gabite.