Easy experience
To get easy experience for your lower level characters go into any battle and order your lower level character to attack one of your own characters that has a much higher level When the attack meter appears press X at the lowest point so that the damage done is not too harmful The amount of experience gained depends on how large the difference is between the two characters The best place to do this trick is in the first set of levels of the Tower Of Trial where your opponents should not be dangerous
Level up coins
To level up coins to their Forbidden Force level they must have the following stats MCP 160 RNG 7 AOE 25 POT 170 To reach these stats you must have coins that were either bought or found at level 4 You can obtain a hidden level 4 Gain Coin in the Temple of Earth battle with Blackthorn Equip a party member with the Hawkeye ability to find it After you have acquired the specified stats engrave the emblem of the coin with another seal For example engrave the Ema emblem and Tundra on your Gain Coin Once leveled up they or their stats cannot be changed When used they will hit everyone onscreen