Season pork loin with salt and pepper and place in a slow cooker.
Puree 1/2 of the pineapple with chicken broth, orange juice, red onion, vinegar, lime juice, chipotle pepper, 1 teaspoon adobo sauce, garlic, chili powder, salt, cumin, garlic salt, 1 teaspoon black pepper, onion powder, and oregano. Pour over the pork. Add remaining pineapple and frozen corn.
Cook on Low for 8 hours. Shred pork and warm for an additional hour.