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I am using Pokemon Diamond for my example since it focuses only on the trading aspect.
Platinum has a bunch more bells, whistles and doodads but for the most part I've noticed that a lot of people are still using D/P since they cannot afford or purchase Platinum at thise time.
It's the same thing in Platinum, just just have to walk forward further. The GTS is on the first floor. Don't take any of the Warp Panels unless you want to do the other stuff like Vs. Recorder, etc.
I am going to teach you how to use the GTS. It confuses some people, and some just don't understand how it works.
It's quite simple really, but it helps if you have a giant number of Pokemon SEEN. If you've seen a Pokemon, like Skorupi, you can search for it, or put a Pokemon on Offer asking for the Pokemon you want.
If you want a Pokemon you haven't seen, such as Squirtle, you're out of luck.
Anyway, I run over the basics of finding a Pokemon, offering a Pokemon, and trading a Pokemon using the GTS.
Also, you can use the big Globe over there in the GTS Lobby to set your location and see areas where people live that you've traded with.
This isn't necessary, which is why I cut it from the video to save time and file size.
It's still an interesting option and you should check it out anyway.
This is the only way you can obtain foreign Pokemon without trading with someone who has a foreign game directly.
Also, I'm pretty sure that Seaking is still on Offer lol. So if you want a Pokemon from GekkouKitsune that has an interesting name nonetheless, go take a Ditto and search for female Seaking! (pun not intended. Search, seeking, seaking..?)