How do you transfer Nintendo DS games you own to an R4 gamecard?

To transfer Nintendo DS games to an R4 game card, you need to first ensure you have a compatible R4 card and a microSD card inserted into it. Use a computer to download the game ROMs from your legally owned games, then copy these ROM files to the microSD card in a folder designated for games. Finally, insert the microSD card back into the R4 card, and you can play the games on your Nintendo DS. Remember that distributing or downloading ROMs for games you do not own is illegal.