The Monsterpedia description states: "A very shy creature, Aria's voice can be heard for hundreds of miles, even when it isn't yelling. Its singing has been known to soothe even the most angry of beasts. Many trainers want an Aria to assist them in capturing a fickle monster. It has a little control over the psychic energy stored in its body, but if it tries to use it, then it usually backfires. On rare occasions, there are some Aria who have a natural control over the power."