For a pet, there were only three ways to grow.
Food, training, and battle!
Converting nutrients from food into what was needed to grow was the easiest.
Training was slightly more difficult, but through training, one could hone their racial abilities to a higher level, thereby promoting growth.
Battles were the most dangerous, especially in life-and-death battles where one's willpower and spirit had to be highly focused. This type of training for pets was the greatest. The growth experience gained from using abilities in high-intensity battles, after all, was also not something that some basic training could compare to.
In fact, it was impossible to nurture a powerful pet without all three: sufficient and nutritious food, reasonable training, and appropriate battle training.
