Thought this over for a bit, but I was confused as to what we could do for this without it just saying "Smogon University" and leaving it at that, while also trying to avoid copyrights and such. Seen as how the first shirt was so simple, but we still got in trouble for it, this gave me a lot of trouble. But then a brilliant idea came to me: the regions in the game.
As long as we don't put in the towns or routes or anything, and just leave them as a blank map of the region or something, TPCi, NOA & co shouldn't be able to file a trademark/copyright complaint against it, since the regions are pretty much nothing more than parts of Japan in the first place. Thinking down that road, I came up with an idea based on that (of course, I definitely don't expect mine to actually be used (though of course I wouldn't mind if it was) as my Photoshop skills are craptastic, but just to give an idea of what I mean):
Front:
Back:
For the front, I just took a blank map of Japan I found online, then cropped it to the bulk of Hokkaido, which was used for Sinnoh. After that, since "Smogon" comes from Koffing, I filled the Hookaido-map with a purple-circle gradient, to give it a poison/acid bubble feel. Then I just copied/pasted to a blank-shirt, added the text and background fill, and finished off by doing likewise for the back.
Like I said though, this is just a rough idea, and I don't have the Photoshop skills to do much better than this myself. But if someone else were to use this as the basis for the actual design, I think we would be able to get a pretty awesome shirt made that TPCi & co wouldn't be able to make any solid claims against.