Preheat the pellet grill to 225°F using your favorite pellets.
Trim the brisket while it is cold. Remove loose edges and hard pockets of fat, square the sides, and leave about ¼ inch of fat on the fat cap.
Mix the kosher salt and black pepper together. Season the brisket evenly on all sides, including the edges. Let it sit while the pellet grill preheats, or refrigerate uncovered for several hours if seasoning ahead.
Place the brisket on the grill, fat side down, with the point facing the hotter side of the smoker.
Smoke the brisket unwrapped until the bark is dark and no longer rubs off easily. This usually happens around 165°F to 170°F internal temperature in the thickest part of the flat, or about 8 to 12 hours.
Wrap the brisket tightly in pink butcher paper and place it back on the smoker, seam side down on the grates.
Continue cooking until the thickest part of the flat is probe tender, usually around 200°F to 203°F internal temperature.
Wrap the brisket in an old towel and place it in a cooler to rest for at least 2 hours before slicing. The cooler will keep it safe and warm for at least 2 hours and up to 6 hours. Keep the thermometer in the brisket while resting to ensure it is in the safe zone, above 140°F.
Slice the flat across the grain into pencil-thick slices. When you reach the point, rotate the brisket or separate the point from the flat so you can keep slicing against the grain.