It is better for your metabolism to eat 6 small meals a day. When you limit yourself to only one or two meals a day, your body holds on to every little bit of fat it receives, causing you to gain more weight. Your body thinks it's starving, so it retains more fat and water. By eating smaller portions more frequently and drinking plenty of water during the day, your metabolism is regular and steady and is able to work efficiently.
When you skip breakfast and eat only lunch and dinner, your body holds onto the fatty parts of those meals... If you eat Breakfast and Lunch, you at least have the rest of the day to work off some of the calories. If you eat dinner as one of your only two meals, you end up sleeping on that meal's fat and you don't burn any off...
