the best way to find out its happiness is to take it to daisy in pallet town. afterward, make sure to get it really close to its next level at night, but make sure it doesnt fully level up. finally, train it during the day and it should evolve into espeon.
Dont level your Eevee at night? :P
to make sure it evolves into espeon and not umbreon is easy: dont play at night
to get its happiness up, feed it stuff like iron (anything that u can feed it)
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