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I managed to get it to work on Stadium.
First a started a new game in the final japanese Pokémon Gold (rom named "Pocket Monsters Kin (Japan) (Rev A) (SGB Enhanced)"). The I saved and, in the Project 64 emulador and using the N-Rage Input v2 plugin, chose the beta Gold rom ("__GOLD_DEBUG_BLPATCHED.gbc") and the final japanese Gold rom save.
The game recognized the beta rom as the final game and my japanese Gold save with my only Pokémon, Totodile. But it had longer loading times on the start screen than normal.
Oak's Lab works as normal, but, surprise, the game gives me only a black screen when I try to access the Pokédex.
Meanwhile, in VBA, I can't load the final game save into the beta rom. The beta rom will just start as usual. And its saved game also can't get recognized by the final game.