I don't really have a reason for using Emerald in particular.
BorderMonsters is gonna take place in Hoe-Inn, while BorderMonsters (Kanto) takes places in Kanto. The biggest idea I have is Kanto's events somewhat happens alongside the events of what is going on in Hoe-Inn. Things could always change though.
To be honest, I barely made progress because I am still trying to implement a No EXP patch.
Might have to just focus on the mapping and the story until I start putting focus on the other big stuff.
The reason I say GTA barely had inspired something is because I'm thinking the overhauled Vitamins/Drugs system can play a part in being somewhat a criminal. Still up in the air, and while I agree balancing is a big issue I have to address, that was the reason I considered taking Rare Candies out altogether. The reason I renamed it and kept it is in the PM so you should know it.
My dark humor is probably gonna be the main reason why some might not wanna play it (just a warning).
I'm still wanting to make it, but knowing Nintendo is on a ROM Hack purge spree, if my hack gets very popular, they might take it down.