Ohh, the Pokéathlon! I remember I spent so much time there with my Wynaut in particular. I only wish the Pokéathlon gave ribbons, because I'd love for my Wynaut to have proof that he kicked some serious butt there. And also more ribbons- he's not quite a full-blown ribbon master, there's definitely some I missed, but he's still got a pretty stacked collection.
Also, I liked the little detail that Diglett and Dugtrio were useless in any events that required jumping, and in the hurdle one, they'd dig under hurdles instead of jumping over them. That's attention to detail right there.