How can my EEVEE evolve to ESPION nor UMBREON in pokemon diamond?
If you want your eevee to evolve into umbreon, make sure eevee likes you alot during the night, if you want an espeon, make sure that eevee likes you alot during the day. To make it like you, you have to prevent it from having very low health and try to heal it even if it takes little damage, and you have to do it in the most little time as you can.