Some of the Divine Legendaries created by the Original One were granted with a childhood upon birth, maturing on their own by body and power in a slow growth rate that took thousands of years, taking their time to fully become aware of the duties that would sustain the balance of the world.

Some were born in a different appearance compared with their current guise, as Xerneas, just like an ordinary fawn, had no antlers until reaching adolescence.

Some others even possessed a slight (or major) different color scheme.

For one reason or another.