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>Dittos are corrupted Mews
>Ditto and Mew are the only two Pokemon that can use Transform.
>They have the same coloration, both in their normal and Shiny forms.
>They weigh the same amount, at 8.8 pounds.
>What corrupted the Ditto-Mews is anyone's guess, maybe they were failed clones (there's established lore in Pokemon that scientists have tried to clone Mew, that's why Mewtwo exists), or transformed so much that they forgot what they used to be.