I assume that's what people have been wanting when they've been asking for a "Legends Unova" game.
...
WHY?
I don't know how they could deliberately based a games setting on a place where the biggest atrocity in human history ever happened and then deliberatley choose to focus only on the chocolate, sauerkraut, lederhosen, and Flula. Same with the american south (only you have even less to distract you from the history of slavery since everything there is pretty much designed to remind people of it), and retrospectively Unova and the four Japanese regions. It feels like deliberate ignorance to explore those themes without acknowledging the pretty big elephant in the room.
I'll repeat what several others have been saying here:
Because it's not real life history.
Pokemon bases it's regions on real world countries and their culture. Not their history. Not everything about any of the Pokemon regions is 100% accurate to the real life one each one is based off of. Otherwise, you might as well just say they're the actual real life countries.
There's a reason for that. It's fictional. The regions of the Pokemon games
do have similar cultures to real life cultures, but not fully identical ones. These regions have their own histories, not reflective of those in real life. And while the games
have had more serious storylines and villains like Cyrus, Ghetsis and Lusamine which have tackled some serious subjects, Pokemon has never been the place for subjects
that dark.
Pokemon games are meant to be about fun adventures and bonding with Pocket Monsters who can kick ass. Not a history lesson focused on reality's worst atrocities and crimes. And I don't think the franchise would be half as enjoyable or charming if they were.