"Fairy Wind usually involves flapping wings to stir up Fairy-type energy. Eevee doesn't even have wings, so naturally, it can't use it."
Xiao Ran paused, then explained with a wry smile. It would truly be a miracle if Eevee could learn Fairy Wind. Perhaps it might be possible if a Flying-type evolution of Eevee appeared someday?
"Oh~~~ All right! That was stupid of me!" Wang Yunshu said, covering her forehead in embarrassment.
"Actually, learning Fairy-type moves is simply a sign that the energy concentration inside Eevee has reached a certain level. After all, the energy inside Eevee is extremely unstable. Without move training to stabilize that energy, its evolution can easily go wrong!"
"Its evolution can go wrong?" Xiao Ran's explanation startled Wang Yunshu. She had never heard of such a thing before.
"Yes. It only happens with a very small number of Pokémon, and Eevee happens to be one of them." Xiao Ran nodded.
"Let me give you a simple example. Eevee needs a certain level of friendship to evolve into Umbreon, Espeon, or Sylveon. You know that, right?"
"Mm-hmm!" Wang Yunshu nodded.
"But once its friendship is high enough, Eevee evolves into Espeon during the day and Umbreon at night. So why can it also evolve into Sylveon?"
Wang Yunshu froze. That was right! All three evolved through friendship, but one evolved during the day and another at night. That already covered the entire day, so when would it evolve into Sylveon?
"That's where the concentrations of different energies inside Eevee come in. It evolves into Espeon during the day because it's in a better mental state then, and its Psychic Field is abundant."
"The same principle applies to evolving into Umbreon at night. The Dark type originated from the Lunar Type and darkness, and is one application