What is the most effective form of dieting to lose fat? I am 215lbs and i am around 20% body fat. Also what would be the best way to increase the fat burning effects?. im not looking to be shredded just want to get lean.

I do NOT recommend "dieting" to lose fat. IMO, "diet" is the term for your LIFESTYLE NUTRITION, and you just adjust this - predominantly your calorie intake - based on your goals.
I recommend reading the article The 3 Keys to Fat Loss, as it gives a comprehensive review and information re nutrition for fat loss, as well as covering supplementation and training to lose fat.
~Team APPNUT
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The best fat loss diet calls for quitting processed food. You must maintain the nutrient to calorie ratio of whatever you eat.Eat a healthy nutritious breakfast and have an early dinner. Your breakfast lays the foundation of your metabolism for the rest of the day.