This is an early analysis, this may be dated or low effort

Role

Shuckle has one niche in the meta: setting up hazards and fainting. With this month speed tiers being particular weird, Sticky Web can help strong but slow sweepers such as Emboar to demolish teams if unprepared. Shuckle also has Stealth Rock as another hazard it can set up, providing much appreciated chip. 

Sets 

As mentioned above, Sticky Web and Stealth Rock is basically all Shuckle has going for it. It is most commonly used as a suicide lead, with it basically being dead weight after setting up hazards. Other moves it runs are Toxic and Infestation to get residual damage or Knock Off to take away useful items like Eviolite for P2 or Bisharp. Red Card is used to stop any sweepers from setting up and providing weird positioning. Custap allows Shuckle to set up rocks if it gets down to Sturdy. Gluttony + Aguav Berry (or other such berries) are used to provide Shuckle with a little longevity. 

Written by CringeCat

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