What bottom dwelling flatfish with white meat is served best butter?

The flatfish with white meat that is best served with butter is sole.

Sole is a delicate, mild-flavored fish that is perfect for simple preparations. Butter is a classic pairing for sole, as it helps to enhance the fish's natural flavor and creates a rich, creamy sauce. You can also add lemon juice, herbs, or other seasonings to the butter for extra flavor.

Other flatfish with white meat include flounder, halibut, and turbot, but sole is generally considered the most delicate and best suited for simple preparations like pan-frying with butter.