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Anyone seen this 'mon?
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Technically it was just because of an old cache of game models, not an old app version, but same difference. People that were seeing Keckleon reported that restarting the app would fetch the new files with "Nutto"'s assets.
Image assets are downloaded on-the-fly as they are needed. This allows for them to release shiny pokemon and pokemon with hats without needing an app update. In order to sneak Meltan into the game without an app update, they replaced the image assets of Keckleon, an unreleased Gen3 pokemon that is already in the game code. So what we are seeing now is technically Ditto disguised as Keckleon with Meltan's model.