When playing Lysandre, who chooses which of the opponent's Benched Pokemon get brought forward?
The card says "Switch one of your opponent's Benched Pokemon..." so the person playing Lysandre gets to choose.
Source: Flashfire FAQ (2014-05-08), TPCi Rules Team (2014-05-08)

Relevant cards

Note: All applicable cards may not be listed below.
XY2_104
XY2_90