Everybody know you can open many window of your own I.D but you all doesn't know this.
Open around two windows and leave one alone(move it sometimes but not after 30 minutes)
Fight in a gym or shadowstorm or live battle. When you almost out of potions, Go to the window that I call you to leave it. Remember that you leave at least one potions as thelast potions before you add more potions. The window that doesn't fight go to the buy Iventory and buy potions. The next round after you use the last potions, It will add how much you buy the potions. Keep doing this when you are almost out of potions.