In the recent "Yu-Gi-Oh! Quarter Century Celebration" livestream hosted by KONAMI, it was officially announced that Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist, originally released on Game Boy Color in 2000, and Yu-Gi-Oh! Duel Monsters 6 Expert 2, released on Game Boy Advance in 2001, will be arriving on Nintendo Switch & Steam in the form of a remastered collection.
In addition to the two titles mentioned above, the official announcement also suggests that there might be future releases of remastered classics from the Game Boy Color and Game Boy Advance era. Detailed information about these games and their release dates will have to wait for further announcements.