Diglett @ Black Sludge  
Ability: Arena Trap  
Tera Type: Ice  
EVs: 252 Spe  
Hasty / Naive Nature  
IVs: 0 HP / 0 Atk / 0 Def / 0 SpA / 0 SpD  
- Substitute  
- Protect  
- Sandstorm  
- Stealth Rock / Sucker Punch

Diglett

Diglett is reasonable fodder: Hasty Black Sludge Diglett is OHKOed by Pawniard and Cufant Steel Beam as well as Struggle from Timid Pokemon with base 85 Attack and above (e.g. Zoroark, Meowscarada, Cyclizar). You can go with Naive so Diglett is additionally OHKOed by Tinkatink Steel Beam, but you now miss out on the guaranteed OHKO from Struggle from Timid Pokemon with 85-94 base Attack (e.g. Hawlucha, Murkrow). Diglett's main niche as fodder is that it is also a trapper. Diglett fits well in teams with a Gothitelle-line Pokemon as a result, letting you swap between said Pokemon and Diglett in order to stall out a trapped Pokemon Tricked a bad item. Diglett's movepool is barren enough that Sandstorm, Sucker Punch, and even Stealth Rock are legitimate options: Sandstorm can provide chip to teammates, Sucker Punch lets Diglett not deal damage when Taunted a fair chunk of the time, and Diglett can try to set Stealth Rock for the team...at least on Magic Bounce users. Tera Ice lets Diglett become even better Steel Beam fodder and also lets it become weak to Stealth Rock.

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