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Hey, I think I joined for that very same reason. I wanted people to join with me so I could trade online and stuff, and it does work out pretty well. :D Welcome to the community Ryota. :)
Cool name btw. :D
So if you want to add people to your Pal Pad, the best place to start off would be of course, the Trade Corner, which can be found here for your pleasure. :) There's a few people there that like to trade, and it's quite active, so you should be in luck there. Just make sure you follow those rules there, as well as for the forum in general, and you should be fine.
So welcome aboard, and just have a great time here, okay? :3