Discord, after learning of an impending threat, he must prepare the Mane Six for a villain, and get a cheap laugh from it while he's at it. In Discord's dimension live several interesting beings, or copies of them at least, similar to beings that the Mane Six may face in the future. So Discord puts them through a brief, yet educational period of time where they learn about these villains, without even knowing that they're learning anything.
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The result of me trying to rush a piece of writing 1000 words long, without prior inspiration, or planning.