>>35470007Simple. Have each region share the same level curve and utilize in game mechanics to discourage people from using the same team. For example, some gyms may refuse to face against players with a team that is an average of X levels above theirs, a reward system for starting each region fresh, a downward curve for XP and money gain for players using higher leveled pokemon, as well as making it significantly easier to change what pokemon is in your party. Additionally, having Battle Tents scattered all over the world would allow for players to bring back their old mains when they've otherwise stopped using them.
I don't like the pokeworld game idea for a million reasons but its not like the level curve is an insurmountable problem