Liberally season the pork with salt, pepper and garlic powder, then brush the top with your favorite barbecue sauce. Place in a slow cooker on low for 8 hours (or on high for 4 hours). Shred pork with two forks, and mix with extra barbecue sauce (amount will vary depending on size of your pork and your desired coverage - we like it saucy, so we added about a cup to our 3 lb pork roast).
Combine all of the slaw ingredients, besides the slaw itself, in a bowl and mix well. Stir the slaw in until thoroughly coated. If you use a traditional coleslaw type of mix, I would wait until you are closer to ready to serve to mix so it doesn't get soggy. The broccoli slaw holds up better, which is one reason I like it better.
To assemble tacos, warm tortillas then top with generous helping of pulled and then top with the slaw and devour!