I had a linkshell mat do this. Its a major exploit in the game. Only 1.0 players can do this I think.

What he said happened what on the lodestone database website said he was lv50 Carp but he stopped at 1.0 as lv23 and he said Market Board also said it synced him to lv50 carp to search for items. So he tested to see what happen when he equipped a lv50 tool. Guess what he level up a bunch of levels and was lv50 carp.