Heat the oil in an ovenproof pan, dust the skate with flour. Brown the fish in the oil on both sides and add the garlic to the oil. Add the caper fruit, olives, oregano, lemon juice, and salt and pepper to taste, to the dish. Cover the fish and braise in an oven set at 170°C/325°F/gas 3 for 10 minutes. Lift the skate from the sauce, return the sauce to the heat and reduce until glazed. Pour the sauce over the fish. Serve the skate sprinkled with parsley.