Espeon worth powering? 100IV, zen/psybeam

For a defender, you really want confusion. I'd hang onto it but not power it up.

Pretty much the worst possible moveset. I wouldn't spend dust on it at all. While it might be his second best or so defending moveset, I find Confusion far more valuable on Espeon if you're going to leave it in gyms since all it does on defense is deliver a lot of damage within its short lifespan - and Confusion does a hefty 66% more damage per hit.

It all depends on your game strategy.
I have the exact same Espeon, same moveset and all. The odds of getting a 100% iv mon is gigantically small.
Sure its not the greatest moves, but there aren't many mons with a cp around 3000 maxed out with 100%!

I maxed mine fully out to 2958, because i can (level 38) and sometimes i throw it in gyms if theres something lower as a buffert!

I would power it up. Any 100% IV mon of that caliber should be powered up.