I’m not super familiar with competitive Pokemon, so I can’t give any suggestions for that, but I will say that most of my more “niche” interests either have a 3-5 subscriber community with no activity or no community at all.
But that’s a great opportunity to fire up a community yourself to get things kicked off.
It’s super easy to make yourself, if it’s not locally available to you. There’s plenty of recipe guides online and the barrier to entry is a lot lower than being beer.