Place the swordfish, pineapple chunks, red onion, and red bell pepper in a large glass or other non-reactive bowl.
Add the olive oil, lime zest, fresh cilantro, and garlic powder and season with salt and black pepper, to taste. Gently toss to combine. Set aside to marinate for 15-20 minutes, stirring once or twice during that time.
Spray a large grill pan with non-stick cooking spray (or lightly grease with butter, olive oil, or coconut oil). Set over medium heat.
Thread the swordfish and veggies alternatively onto skewers. Working in batches if necessary, place on the hot grill pan. Cook until the veggies are slightly charred and crisp-tender, and the fish is flaky, approximately 2-3 minutes per side.
Remove from heat and serve immediately with our Instant Pot Cilantro-Lime Rice, if desired, and lime wedges on the side. Enjoy!