Reproduction carts are the cheapest way of purchasing some very expensive games if you want to own physical copies. I currently own a few Pokemon reproduction cartridges, I have Emerald, Crystal and Green. I own real versions of Crystal and Green, so I mainly just bought them since I thought they looked funny. Anyways these are good up until they stop working. For example, my fake Crystal version doesn't have a real time clock in the cartridge yet the save file was deleted. I also noticed that some of the text in my repro cart of Green has glitches, and I'm not sure if it's because the save file is corrupted or if the rom itself had this issue since this is a hack that translates the game into English.