The ranks change depending on the number of posts you have, so you have Bug Catcher to start, but when you get 25 posts, that changes, then 50, 100 and so on. But don't spam the forum for posts, the ranks mean nothing outside of that they are there.
Trainer cards however are different. Not so long ago, they meant you could enter compititions, and achievemnts are recorded there. But now, they mean nothing, as I think you mean the TCs given by the Mods, which are unavailable at the moment. However, if you want one just for decoration, ask in Sunnyshore Market.
Friend Code:4553 8643 1605
Feel free to add, I'm (almost) always up for a trade.
And Umberia from Afonso. Click my sig if you want one like it