This will be hard and considering I don't have that much spare time. I will be able to map, but it will take a while. Are you sure you don't want to ask a more competent person?
I can try and map Sinnoh using Fire Red but do you want it exactly the same or with a bit of versatility? Also, I'm not sure the Sevi Islands can be mapped to different regions as the game doesn't have enough space and map for it.
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can u make a sinnoh map using fire red
and can u make the sevi islands into kanto, jhoto, hoenn