It may be that just that game isn't dumped 100% correctly perhaps? Seems like it just may be a bad dump, and considering that game is so old, and dumping methods have been refined since then that the game may require a redump.I'm wondering if there's any DS linker that supports Yoshi Touch & go download play...
they seem to have a very special type of protection; for some reason the rom successfully starts on the remote DS, but you can't actually get in-game (freezes after the 3..2..1...)
Although it could be what I said is 100% false! And just maybe, for some reason, there's lots of extra protection after all...