Commonly, we used Lapu-lapu fish for this kind of dish. My mom made some twist and make use of Tilapia instead Lapu-lapu.
Now here’s how to cook a Sweet and Sour Tilapia

Ingredients:

1 whole Tilapia, about 1.5 kg., scaled and gutted
salt and pepper. You can also vut it into pieces if you want to
1 tbsp. of cornstarch
3 [...]