I'm blind and would be interested in there being an accessible version, but it's just not ever going to get made. Seems like pokestops or whatever they're called could be represented as a plain native list, with Maps integration for voice guidance to the point if you don't already know where to go.
And it looks like the in-game action is fairly simple. Could probably render it with positional audio, which has been done in accessible games for at least a decade [1]. I wear a bone conduction headset, so I could listen to the audio cues overlaying my actual environment. It may be hard to model the catch mechanics, but I assume they aren't too much more complex than "center one thing on another and throw," which again audio games have pretty much figured out.
Seems like a fun project. Might give it a shot if I can stomach the risk of getting randomly shut down one day.
Edit: Speeling
1. http://audiogames.net Kind of an annoyingly bad site in some respects, but useful info all the same.