Gothitelle @ Leftovers  
Ability: Shadow Tag  
EVs: 244 HP / 108 Def / 156 SpD  
Calm Nature  
IVs: 0 Atk  
- Charm / Barrier  
- Confide / Amnesia  
- Taunt  
- Rest
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Optional Move(s):
- Cosmic Power  
Optional EV/IV(s):
- 252 HP / 192 Def / 64 SpD Calm Nature  
- 252 HP / 252 Def / 4 SpD Bold Nature  
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Gothitelle @ Leftovers  
Ability: Shadow Tag  
EVs: 252 HP / 252 Def / 4 SpD  
Bold Nature  
IVs: 0 Atk  
- Barrier  
- Calm Mind  
- Stored Power  
- Rest
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Optional EV/IV(s):
- 252 HP / 192 Def / 64 SpD Calm Nature
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Overview:
Gothitelle is known notoriously for trapping and neutralizing a majority of passive defensive pokemon, including Chansey, Ferrothorn, most defensive hazard removal, and situationally punishes Choice Scarf users thanks to Shadow Tag, access to Taunt and its various stat drops or boost, which can support sweepers to break through teams and even gives its teammates a free turn to get in safely. Despite its decent bulk, it gives no defensive utility due to lack of useful resistance, which leaves it rather awkward or hard to fit onto most teams. It is also matchup dependent, while it has a great matchup against more defensive team, it tends to struggles against more offensive team as they can simply overpowered it. It relies on certain moves and EV spread in order to reliably trap specific pokemon and is prone to an unexpected lures if not properly scouted such as Shed Shell users, certain moves and Z-Crystal.