the best reason to put it on DS is so people could use the XABY codes propperly, unfortunatealy they didn't put X&Y buttons on the GBA a huge mistake in my opinion, since i don't have FFVIA yet i'm still at a loss as to how they did Sabins Blitz Techniques with only 4 buttons (ABLR) instead of the standard six (ABXYLR) it originaly used, i wouldn't want to see Chrono downgraded in such a way as to mess up the subtle button jokes and codes used throughout the script, so DS would be the best choice, if they ever decided to do it...