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You would of course visit the Oak's Lab building, where the "Oak" cosplayer will allow you to choose your starter. You'll also get a trainer card based on the package you wanted to sign up with - a Red card for Red Version, Blue, Yellow (costs more), FireRed, LeafGreen, or whatever, and that would decide which Pokemon you encounter based on the sets from the actual games. The Yellow card is considered a premium experience because you get to meet and greet with Jessie and James cosplayers and benefit from whatever other Yellow-only features there were, I forget. Basically, as true to the games as possible. You'll also obtain a real "Pokedex".
You then set off on your journey through real routes, though quite short. Tall grass is where you can see projected images of Pokemon and throw real-life Pokeballs to catch them, much like Pokemon Go. Ledges will be represented by a short set of steps down.
(3/?)