You may be thinking of the “Pokemon Go Plus” device...alerts you to Pokemon & “waypoints”, etc. without having your phone in your face...still, it is a Bluetooth device connected to your phone, and would require you to “log-in” as normal. You can also just sign up at “Pokemon.com” w/your e-mail to be a “trainer” and use that account for Pokemon Go and SKIP the whole Google account sign up stuff.
Pokemon Go Plus: http://www.pokemongo.com/en-us/pokemon-go-plus/
If I wanted to play this game, I would certainly avoid signing up for a Google account ... they collect WAY too much information and who knows who will see it.
Again, my children think I'm paranoid ... but I would prefer to err on the side of privacy.
Thanks for the info, FRiend! :)