by tcdev » Tue Nov 14, 2017 4:44 am
For the most part, they haven't been dumped and likely won't be for some time now.
There is a dump of the NGCD version of at least one of those games (I won't say which) floating around.
However the cartridges have copy-protection and in general no-one is willing to reverse-engineer/circumvent that and implement in an emulator at this time because doing so would only serve to discourage further development by the NGDEV team. And the NeoSD, for example, is refusing to support the newer games.
Unfortunately the newer titles are way beyond my means so like me, you're probably going to have to wait until a decade or so has passed before someone deems it 'acceptable' to dump & support them in an emulator.