I don't like to pre cook my fish cause i don't like the way it reheats.
I use a cast iron skillet , get it hot as fuck.
season add a light coat of oil to the fish then season and sear in the pan quickly , this is a called "blackening" it looks burnt but its just the seasoning that gets crispy.
Tilapia is cheap and easy to get but iof you can spend a little more a get better fresh fish from a market you are far better off. Most of the fish i eat is caught here by the family
you can get a whole flounder and bake it , make a lump crab meat and or shrimp stuffing , butterfly the top of the flunder and stuff it with crab meat and bake it.
you can also bake or grill the fish in foil pouches like mentioned above , a lttle butter , crushed garlic and chopped veggies make a great meal