you should do it. i played that challenge as jasmine and my team was hella fun to use. i also worked really hard on those list of gym leader pokemon lol wouldn't take much to add in gen 7 probably to revive it, but hoo boy i don't feel like making THAT much effort.
I wanted to bring that challenge back about a year ago, but couldn't find the thread and doesn't really felt like updating lists for everyone.
So the gist of it is it would be based on A Song of Ice and Fire (aka Game of Thrones), and besides normal nuzlocke rules, Pokémon would be sorted into one of the nine great houses (based on their nature, or something like that) that would have individual challenges tied to each of them. I was also thinking of adding "trainer classes" based on the trainer's ID, that would each also have a condition tied to them (maesters, septons/septas, members of the night's watch, red priests/priestess, etc.). Perhaps also after a significant point of the game, like a new badge obtained, or a trial completed, more challenges would be added. It's kind of similar to the Potterlocke Challenge.
There are still plenty of ideas I have in mind for it, I'm gonna keep thinking.
That sounds great. I remember there was
Game of Thrones Challenge, so you can check it for inspiration.