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Models are one thing, animations and behavior and mechanics are a different thing entirely, and Pokémon fans primarily stick to hacks of the mainline games, where the requirements boil down to swapping sprites, 2D tile-based map editing, and rewriting script. It's a bit closer to editing an XML file in terms of simplicity. The N64 had a notorious history of being difficult to work with and difficult to emulate properly, and only in recent years have we seen major leaps in understanding and decompilations of major games.
