Brown pork in olive oil, do this in small batches to avoid an overcrowded pan. Place browned pieces directly into slowcooker crock.
Meanwhile, work on your marinade. Add the chipotles in adobo, onion, garlic, beer, apple cider vinegar, lime juice, cumin, oregano, ground cloves, salt, and black pepper to a blender and blend on high until smooth.
Once pork is all browned top with bay leaves, pour marinade on top.
Refrigerate covered overnight.
Add the crock to the slow cooker in the morning and cook on low until pork shreds with a fork, about 6-8 hours.
Discard bay leaves and shred pork.