Notes:

Before you ask, Mega Kangaskhan is in fact not banned from Doubles OU until that point because physical attackers aren't as good as they are in Doubles battle and Parental Bond doesn't affects spread attacks.

If you ask me why she is banned, I will simply say "Seismic Toss" (there's Wish, but that's just heals her).

And the fact that Trick Room is awfully annoying in this generation.