Charge Skills are special abilities obtained by defeating enemies in battle. They can be equipped and leveled up in the Garage to enhance their effectiveness. When a Charge Skill is equipped, an "E" symbol appears on its icon, indicating it's ready for use.
To improve a Charge Skill, spend Coins to level it up, with a maximum level of 10 per skill. Keep in mind that the number of Coins required to level up increases with each level. Make sure to equip Charge Skills first to be able to use them in battles.