This is quite interesting. This is Japanese version of Pokemon Gold, not the US/European version BTW.
Oh, so this might be a pre-release translation by whoever pirated this. Was this even a thing back then? - to translate a game for a different region where it hasn't officially been released yet to better sell ones pirated work? Thanks for the info though!
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Yes, that was a practice. It happened with quite a few Pokemon titles. I've seen it with Pokemon Green, Pokemon Gold, Pokemon Crystal, Pokemon Fire Red, Pokemon Sapphire, and Pokemon Emerald. There were also fan translations people tried to squeeze out before the official one, and some of those wound up on pirate carts as well