Place the pork roast in the base of the slow cooker. Sprinkle the ground cumin, garlic powder, salt and pepper on top of the roast. Add the beans around the roast in the slow cooker. Set on low and cook for 8 hours.
When the roast is cooked, shred it with 2 forks.
Prepare the tacos by adding guacamole, then the pork and beans. Roll and eat.
Serve Cumin Pork Roast with Black Beans on tortillas with guacamole and a veggie side dish.