I'm sorry I don't have anything intelligent so say in the introductory post, but this thread is for speculating about different races and cultures in the Pokemon world. We've seen lots of different tribes as well as evidence of influence from both Eastern and Western-sytle cultures. I also think that maybe there's a Dragonrider's clan or two out there. They all wear those outfits and I think maybe it's a tradition. Also, the game mentions Dragonrider clans, I think...
There's such a wide range of apperances in the Pokemon World, maybe the humans all belong to one race, which is actually a mix of all the races that we have on Earth. I don't particularly believe in the "future world" theory (see the Pokemon World history thread), but if the Pokemon world were set in the distant future, then it'd make sense that all the races would be blended.
I also believe that more than one species has cultures. We've already seen that Clefairy are capable of building rocketships and in the Special Manga, Misty is a mermaid. I know the manga and anime are completely different, but it would be cool if there were actual mermaids in the anime world, too, wouldn't it?
You can also discuss Pokemon world religions here if you want, though I don't have any particular thoughts on the subject.