Donate? Stones

Hi im new to the game and saw someone say something about they had high atk through donate and was just wondering what that means how you can do that to get stones. Also was wondering best lvl to farm for stones

Easy way to get stones is farm xx-10 lvls with infinite stamina

HI . Give me please a name of the hack for this game . Play this game on Phone not pc . Thanck you verry much .