Ugh.
I was briefly a comic-book store owner when the whole Pokemon craze was at its worst. I saw crazy kids like this ALL the time. They came in more for these cards than comics, which was depressing.
Anyway, I saw enough lying (to moms), cheating (in card games), stealing (of friends cards), and agressive behavior revolving around Pokemon to declare it evil. It truly promoted the worst attributes in these kids.
I'm so glad I walked away from that nonsense. Is there anything like this that has kids just as worked up today?