When I discard my Benched Pokemon for M Gardevoir-EX's "Despair Ray" attack, does my opponent get to take prizes for them?
No, you are discarding the Benched Pokemon, not knocking them out.
Despair Ray





x2
-20
Despair RayDiscard as many of your Benched Pokémon as you like. This attack does 10 more damage for each Benched Pokémon you discarded in this way.
When I discard my Benched Pokemon for M Gardevoir-EX's "Despair Ray" attack, does my opponent get to take prizes for them?
No, you are discarding the Benched Pokemon, not knocking them out.