Line a mini muffin tin with paper liners or prepare a silicone candy mold.
Create a double boiler by placing a heat-safe bowl over a saucepan with an inch of simmering water. Make sure the bottom of the bowl doesn't touch the water.
Add chocolate chips and coconut oil to the bowl and stir occasionally until completely melted and smooth.
Using a small spoon, coat the bottom and sides of each liner with chocolate, creating a chocolate cup.
Place the chocolate-lined cups in the refrigerator for about 10 minutes to set while preparing the filling.
In a medium bowl, combine peanut butter, powdered sugar, and butter. Mix until smooth and well incorporated.
Gently fold in the well-drained pickle relish, fresh dill, and pickle juice.
Remove the chilled chocolate cups from the refrigerator and add a small spoonful of the peanut butter pickle filling to each, leaving space at the top for the chocolate seal.
Reheat the remaining chocolate if it has begun to solidify, then spoon it over the filling to seal each cup completely. Give a gentle tap on the counter to help settle the chocolate.
Sprinkle each cup with a few flakes of sea salt before the chocolate sets.
Refrigerate for at least 1 hour until completely set