Social Butterfly Achievement in BattleCakes

In battle, you have two ways to "defeat" an enemy, for this option, you'll want to use your "befriend" command to increase the green gauge until it meets the red gauge. If the green gauge is more than 75% when that occurs, you will befriend the enemy and they will be removed from battle. I would use this option for the first sections of the game, then switch to normal attacks for the rest of the game.