I was thinking about how we haven't had anything to teach Body Slam since gen 3, when it occurred to me that such a move would, in theory, be a really nice fit on Mega Kangaskhan. Typically, the balance between Return and Body Slam is that you sacrifice one sixth of your damage output for a 30% chance of paralysis. However, on Mega Kangaskhan that chance increases to 51%, and you still lose only one sixth of your damage compared to Return. So I was wondering, why is it so rarely seen on it? Just about nobody used it prior to its ban, and now that it's in ubers Return is still the near-unanimous choice.
There IS an opportunity cost that comes with Body Slam, however, and it's the fact that it's only legal with Early Bird. The benefits of Scrappy are well documented by now, but are they really enough to make up for the lack of paralysis cheese? Besides, the specific quirks of the uber metagame make Early Bird much more desirable than in OU, with the always threatening Darkrai and the lesser presence of the Ghost type. (Edit: Why do I always forget about the Ability Capsule? Probably because its relevance in simulator play is restricted to a handful of extremely niche scenarios. Such as this one.)
Other than being forced into Early Bird, though, there really is nothing else important you can use. All the major moves seen on Kangaskhan are legal with Body Slam. So why is it never used? Is the extra damage that crucial? Or is it just that no one thinks of gen 3 tutors anymore?