You can dump games without being in a group like Evil Chicken dumps stuff once in a while.Otherwise check out the NFO files given with roms.I can get a hold of allot of those undumped games but I can't seem to contact a dump group
Released in Europe (not sure what date, but it's definitely out):
Essential Sudoku (E)
Released in USA:
Polarium Advance (U)
Added Essential Sudoku but Polarium Advance is a GBA game.
Try to prove me wrong, but I guess these 5 dictionaries/phrase books are still not dumped. They (obviously) were released only in Japan.
http://www.nintendo.co.jp/ds/aubj/index.html
They're quite chip to get, not much than 20$ brand new or even less. But unfortunately I don't have the equipment to dump them myself.
Released in Europe (not sure what date, but it's definitely out):
Essential Sudoku (E)
Released in USA:
Polarium Advance (U)
Added Essential Sudoku but Polarium Advance is a GBA game.