yes, but bite is crappy and week to say the least, if you want a dark move then get shadow ball, its way better, even though a ghost type move, ghost and dark are both similar and supereffective vs annoying psychics
the best dark move is crunch, but i dont think espeon can learn that
so shadow ball is the best option
edit:oh, i see it already knows shadow ball, if it does then you wont need bite anyways, so get rid of it, its no use with shadow ball already there
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