After the destruction of his home Treyachu decided his kind shall live on with all its traditions, so he learned more about pikachus and their ancestors, gathering information, and heading out on a journey that would change him forever, by the time this journey was over, he had become a completely new, yet evolved version of himself, for his tail can be shrunk and hidden so he can fit into a human society, and his wear are based on pikachu traditions of death.