Attack before the opponent can move
When you were against an opponent, drag down to see your notifications comma then get out of that once you've done that your game should be paused once paused you play it again and then you should be able to move while the countdown is still active.
Energy Glitch
You are not able to battle in any more battles up until you have at least one of them restored when you run out of Energy Cores. For fast boost up your Energy Cores, go to the date and time settings on your phone or tablet and set the time thirty minute forward.