If a Frogadier is in play by itself from the "Water Duplicates" attack, will Espeon-EX's "Miraculous Shine" attack return it to its player's hand?
No. In this case, Frogadier is in play as an Unevolved Stage 1, so there is no evolution to return to the hand.
Source: BREAKpoint FAQ (2016-01-23), TPCi Rules Team (2016-02-11)