@Asmov
Apologies for the small misunderstanding. We cannot provide any kind of region transferring account service where your account is sent back to the previous region. You can however beat the 8 badges of the region to trade the locked Kanto pokemon among your accounts. Do you have any other doubts?
@Hydralisk
Hey there, to uninstall it in PC you just need to delete the whole folder where the game can be found. For android, you should be able to hold the app icon and uninstall it directly or drag it to the "uninstall" option.