Planning has both good and bad meaning, that if making an intricate plan to carry out some secret purpose. The enemies of Allah are always doing that-always planning, always plotting but Allah in whose Hands is all good has His plans also against which the evil ones will have no chance whatsoever.
The evil ones,being servants of shaytan are lower spiritually than even the snake's belly,and their plans however big it may seem to them can only be nothing but shallow, for Allah is the best planner. When the evil ones planned to chase Muhammed out of his birth place,Mekka,in order to kill his message, they thought they succeeded because he migrated to Al Medinah. How shallow that thoughts was,for it was in Al Medinah that he found peace of mind with which he was able to strategies and focus on spreading Islam. With the tension the Mekkans were constantly giving him out of the way,he was able to coordinate the Muslims' activities with a calm and clear mind.
When the evil ones plan their evil and think they have succeeded in hurting you, they are bound to fail,provided you believe that Allah is the best planner and that the evil one's plan is only a mirage.
He is indeed the best planner