>>47236628GameFreak confirmed it 2 years ago. It’s a lot of work to animate and incorporate 900+ Pokemon (more than a thousand if you include all the different forms) when they’d rather reserve development to improve the gameplay (allegedly).
Why do people even find it desirable to locate and capture ~900+ Pokemon? I’d rather have ~300 Pokemon that are well-incorporated into their environments with turf wars, routines, etc.