quick question

is it possible to use a Japanese save file for a usa version of the game? cant recall if it worked for a yugioh game awhile ago. if there is a way can u tell me

Sure, just rename the save file to the same name as the rom and then put .sav or .nds.sav depending on what your other files are.

Would the saved file be in Japanese then? Or would the Japanese save be in English?