1. 3G/4G Switch - Could Switch or a Switch 'premium' model include a sim card option? Maybe a Nintendo online subscription that includes data?
2. 3G/4G addon - I haven't seen a camera confirmed on Switch itself but Nintendo has confirmed addons/hardware so maybe a camera/3g addon might be one solution. I'm not sure how much data Pokemon Go uses but it might be possible to sell an addon that includes a data allowance for a year or include it as part of the game price.
3. Tethering - Connect to mobile data device. Smartphone app acts as a companion to mainline title when no wifi availble. Seems like a clumsy solution but if everybody already has a smartphone, it might be the best option.
4. Pokemon Go will improve the Pokemon Switch experience but the Switch game will not support GPS.
5. Nintendo won't make a 'GPS' Pokemon Switch game.
6. Other.
Thoughts?
Nov 2016 - NES outsells PS1 (JP)
Don't Play Stationary 4 ever. Switch!