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Do not expect any help; pirates put those ROM hacks in the cartridges and sell them, all without the permission of the original hackers and the defiance of the law.
You could be also talking about original pirate cartridges (that is: Pokémon Jade), but I am not sure at how much am I allowed to...
Greetings. I wanted to hack a few new types (the usual 'Dark,' 'Fairy,' and 'Metal' types, plus several others) into Pokémon Blue using Coolboyman's tutorial. Hacking the types that were already there went fine, but adding the types I wanted, even within the bounds of the blank spaces, but the...