If demons and bosses are too overpowered for your team in Shin Megami Tensei IV: Apocalypse, you might want to consider lowering the difficulty if all hope is lost. This guide shows you how to achieve the task.
There are three difficulty levels to choose from when beginning the game (two are free DLC) :
The difficulty can be changed at any point in time, therefore you can begin with the hardest and change back to the lowest without beginning a new save file. This was not possible in the original Shin Megami Tensei IV game (if memory serves me correctly).