That's not actually for any of the Chocobo Dungeon games, but actually the two chocobo magic picture book games - we got the first here as "Final Fantasy Fables: Chocobo Tales". They basically mix minigames and card battles in to what is a surprisingly agreeable formula.
The DS synth of the first game was actually pretty decent (even if the arrangements were generally unimaginative, a problem that seems to dog FF spinoffs). I wouldn'tt say any of it really stands out as good DS music, though. Although it's been linked to in this thread, so I suppose you can judge for yourself.
The synth for the port/remake of Chocobo Dungeon Wii to DS (not released outside Japan yet, and may never be) is actually pretty damn good, and did a very good job at adapting the music to a lower quality format. Some tracks suffer more than others, but most pull through quite well. It seems to have cut and added a few tunes from the Wii version (I can't find "Together Forever", "Guardian of Darkness 1" or "Chain of Sorrows", but the final boss theme from FFIV is in there now, as is Battle 1 from FF3).
Interestingly, in a case or two where effects couldn't be directly replicated, interesting improvisations were made. Compare the Wii version of "Book of Sealings" with this DS version. Granted, the 2sf emulation may not be right, but it's a pretty different way of creating a sinister, unpleasant atmosphere:
http://www.fileden.com/files/2007/9/1/1 … ngs%29.mp3
I can't comment on the second magic picture book (the second disc of that set, and what's referenced with "Mahou to Shoujo to 5-nin no Yuusha"), though. I haven't tried it in VGMtrans and a 2sf set hasn't been ripped.
fake edit hours after starting this post: I probably should've posted this sooner so Terra wouldn't look dumb.
fake edit a day after starting this post: oh so that's what was in this firefox tab