Build an Augmented Reality Mobile-based Game like Pokemon Go

I need to build a mobile-based game with the following specifications: • Augmented reality game for mobile devices, optimized for iOS and works on Android as well; • Platform must be easily and quickly scalable to meet large demand spikes, providing performance and reliability (thinking cloud-based AWS, but looking for designer’s recommendation); • High-definition, three-dimensional graphics, overlaying real-world camera view based upon GPS (as game progresses more virtual reality will overlay real-world) – Unity 3D or other recommended by developer; • Need to be able to designate a GPS location for augmented graphics to be overlaid on the real world and informed of movement within the game-play; • Mobile device must track player’s movement and activity-level while the application is open/active, and update the database regularly (thinking each minute, but would look for the advice of the developer); • Database must track updates and player activities to be used for analytics and driving rules of the game; • Augmented-reality graphics should be able to be revealed based upon level achieved;