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I don't think Battra is evil, he is literally just the dark brother of Mothra.
spoiler
In the end of the movie Battra and Mothra teams up to destroy Godzilla. I don't think Battra ever interacted with the evil fairy girl from the Mothra solo movies, which seems like wasted potential.
peer-reviewed studies have estimated that Mothra's intervention could only provide a 0.5° to 0.6° benefit over a twenty year period
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy: