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So we know Eternatus was what was powering Dynamaxes, and lots of things in their society. I think he was trying to wake up Eternatus so that he could use it as an infinite energy source, but it got out of his control.
I guess the moral of the story is to consider possible ways things could go wrong before you attempt to help? It is pretty confusing though. Maybe the definitive edition will make it more clear and go more into depth about his motivations.