We're going to need a source on that Oddish. It looks like Munch in front of Ma'Spa.
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They would need to create new textures, models, levels, sounds, music, FMV's, code, etc.
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Well most of the models, sounds and code (eg engine and AI) would be the same or similar. They'd probably add a few new characters but they would probably be ones that were originally in SW but cut out so there would be some resources already produced.