I see. What about modifying a memory of a loaded ROM with like hex codes? Is that what PokeMMO is doing as well to change gameplay like show another player's location and inventory?
replyThey aren't modifying the ROM. They've rebuilt all the mechanics from scratch. The ROMs are only there for the graphical assets.
reply>if they do not dump the ROM from their own cartridge
replyThat is a common myth. It can even be more illegal in the case of DS games as you also break the DMCA by circumventing the DS's protection scheme of their games.