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Here's Kanto from the Capsule Monsters proposal. You can see each city (and Indigo Plateau) is given a number based on the sequence in which you visit it. Notably, Saffron City is listed as "T" (presumably for Terminal, as it's at the intersection of four routes, or Tokyo).
It's also notable that each route is named differently. Routes 9-3 and 9-4 became Route 18, but other than that, the old route sequence matches the used route sequence.
