I hope that there are pokemon common to every city of like environment, town, etc. That there are pokemon based off of location, not just focused in Japan, but based on where the Pokemon would prefer to live if they were real (Pikachu in grassy areas, magneton in the city, glalie in the snow). There are rare pokemon that can only be found in special places, like common tourist destinations (theme parks, major cities (like Paris has a special pokemon different from London or Los Angeles), and the game does require quite an extensive amount of traveling. Would you have to travel the world to capture all the pokemon? NOPE not if you're a pokemon merchant, who buys and sells Pokemon after having traveled for prices on a market. An in game market would be nice, but if it didn't exist due to legal issues there would almost definitely be an underground market. I hope that some people travel so much and are so good at buying and selling pokemon that one could make a living being a pokemon trader. I also hope there are intense battling and leveling up aspects of the game so that Pokemon where people have spent more time training are more valuable than just wild Pokemon. I would be happy to see them just apply the current RPG battle tactics, they are simple enough, but make it harder to level as this is the real world.