Ruling Question about "self-KO's"

[Their Goominess]

Ok, I was playing someone at my league, and I used Electrode G's Reckless Bomb (don't ask why), and we didn't know if my opponent was allowed to take a Prize Card? Even our league leader didn't know? Does anyone here know? Thanks in advance.

 

[Craig III]

If one of your Pokemon is knocked out (by any means), then your opponent takes a prize.