Cut the pork butt into 2-3 inch chunks. Mix pork rub seasoning in a bowl and then coat each piece of meat.
Heat the Instant Pot on sauté mode high, for five minutes, add oil and sear the pork. Work in batches and don't overcrowd the pot. Brown the pork on each side for about 3-5 minutes.
Once all the pork is seared, return the meat to the Instant Pot. Squeeze orange juice and lime juice over the meat and add the orange and lime into the pot. Add garlic cloves, onion, jalapeño, bay leaves, chipotle pepper and water.
Place the lid on, lock and seal the Instant Pot. Cook on high pressure for 30 minutes.
Let the Instant Pot natural release completely or natural release for 10 minutes and then vent until the valve drops. Carefully open the lid and place the pork into a bowl and shred or chop the meat.
Strain the juices with a sieve into a large bowl.
In a skillet on medium high heat, spread a layer of meat in the skillet and drizzle some pork juice with fat in the pan. Crisp the meat until the liquid has evaporated and the bottom is golden brown. Repeat with the rest of the meat.
Notes
A quick way to crisp the meat is to layer the meat on a cookie sheet, drizzle juices and broil on high until golden. This does not create the same crispiness as in the pan but is a good alternative to serve if you are feeding a large crowd.
Searing the meat is optional but I highly recommend it for extra flavor!