Hi ChanNJ,
Thanks for reaching out to Apple Support Communities. It sounds like you're having an issue with Pokemon Go app on your Apple Watch. We're happy to help.
We're showing the app is no longer supported by the App Developer when using the Apple Watch. You can find out more information here: Discontinued Support for Apple Watch
However, to ensure all other apps and features work as expected we recommend you keep both your Apple Watch and paired iPhone running the latest OS versions. If needed, the articles below can assist.
Update your iPhone, iPad, or iPod touch
Update your Apple Watch
Additionally, you can find out more about Adventure Sync using your iOS device here: Adventure Sync We hope the information helps.
Cheers!