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Research thread, already found a bunch of sprites/missingnos/unused Pokémon.
All Pokémon that appear but are not actually in the image are based of the HEX index number in the games, allowing us to see the Missingnos.
We can see the deer, the shark, the cactus, a weird Seel-like sprite, a Nidoking-like sprite, a Godzilla, and a round ball that is NOT Electrode.