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What would I do? Make them some foreign entity's attempts at communicating with humans. Make it vaguely explained at best, malicious only by accident or misunderstanding, so powerful or simply different that its very existence is harmful even if it has no desire to be disruptive.
If you want an event to catch it, you'd need to catch Unown Y or N in answer to questions it asks you. Then battle it until it realizes what it's doing and reins in its destructive power to be your "friend."
