Cause Balls

Cause Balls (コーズボール) are an item that can be used to create monsters. The exception is the black ball, which is used to evolve them when they reach level 15. You can obtain them by winning matches or purchasing them at the shop.

Story
According to Dr. Spindle, Cause Balls are the genes of the monsters. You can put 3 of the 7 balls into a special genetic machine, Pschuske, which will conjure the three genes into your very own monster.