Season the diced chicken with chili powder, cumin, garlic powder, smoked paprika, and salt in a bowl.
Cook the chicken in a large skillet with one tablespoon of olive oil over medium-high heat for 6 to 8 minutes, then remove and set aside.
Sauté the diced pineapple, red bell pepper, and red onion in the same skillet with the remaining olive oil for 4 to 5 minutes.
Combine the cooked chicken back into the skillet with the fruit mixture and heat through for 2 minutes.
Warm the tortillas and assemble the tacos, garnishing with cilantro and a squeeze of lime.