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ROM Hacking seems really difficult but I want to make one anyway. I'm only interested in creating a simple ROM that doesn't have any new zones or Pokemon. I want to create an Emerald ROM where I can change which Pokemon appear on which route, change the evolution flag for trade based Pokemon, add items to shops, and change the Pokemon that certain boss battle trainers have.
As someone with zero experience in ROM hacking how hard is this? My goal is to create an Emerald ROM where every Pokemon is obtainable with harder boss fights.