Q: Is Pokemon Go going to be available for the original Apple Watch?

No. Only the new Apple Watch with GPS.

I would have thought it would work but you would need your phone nearby for the gps the newer watches will have the gps built in

That's up to Niantic to decide. They either could allow it on Series 1, but you would need to have your phone nearby for GPS detection, or they could just leave it out so there won't be these problems. I myself hope they do put it on Series 1, since I have one myself