Instead of making games that fans are actually asking for, they just pump out shitty games every few years and make pointless spinoffs that nobody cares about. Not only that, but they also put their employees under immense pressure to finish their games in time. Honestly, Pokemon would be way better if it were made under communism.
Go for it! I don't have the time to lead a new project.
Depending on who's expertise you have, I'd look at forking Pokemon Showdown instead of actually romhacking. Involves more common dev skills, has more ability to turn into a separate non-Pokemon thing, but would need some extra hacking and art to add the actual wandering around the world portion back in.
or just use rpgmaker with Essentials and make a fangame, a lot of assets are already done for you