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Sun Stones are found on Six Island, in Ruin Valley on FR/LG.
And to evolve your Eevee into Espeon, you'll need to trade him to Ruby, Sapphire or Emerald and train him during the daytime, because time is not measured in FR/LG.
to evolve eevee into espeon in r/s/e, remember to check the time in your house in littleroot... i think if it's AM, it'll become Umbreon and PM then Espeon.