If you have a new monster that has trouble in adventures, use this trick to get it leveled up faster. Go to an adventure, it does not matter where. Make sure you have a powerful monster in your party. Battle an enemy, and instead of KOing
them with the powerful monster, weaken them so that they only have a sliver of life renamining. Then, switch with your weaker monster and allow it to finish the monster. The experience will be rewarded mostly to the weaker monster. This is an easy way to give it experience and allow it to gain new attacks and abilities.