From The Bakugan Wiki
The End Phase is the fourth and final phase of each turn. It consists of three steps: the Play Step, the Charge Step, and the Reset Step.
During the Play Step, players can add to the batch by playing cards and using abilities. This is the last time players may utilize these effects for this turn.
During the Charge Step, both players recharge all of the Energy that they control.
During the Reset Step, all Bakugan return to base B-Power, Damage Rating, and Faction.