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)

Relevant cards

Note: All applicable cards may not be listed below.
XY9_117
XY9_25
XY9_39