When Liepard attacks with "Taunt", who chooses which of the opponent's Benched Pokemon get brought forward?
The attack says "Switch the Defending Pokemon..." so the attacking player gets to choose.
Taunt

Other known variants

x2
TauntIf your opponent has any Benched Pokémon, choose 1 of them and switch it with the Defending Pokémon.
Light KickWhen Liepard attacks with "Taunt", who chooses which of the opponent's Benched Pokemon get brought forward?
The attack says "Switch the Defending Pokemon..." so the attacking player gets to choose.