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Reposting a dex entry for Boarealis for opinions:
"The gravitational pull of [Galaxy Turtle] dims their aurora, allowing them to hunt undetected. In time, they leave their hunting grounds, drawn to the Earth's magnetic poles. Upon returning, some Boarealis boast a red mane."
It's about 220 characters, which is a bit long.
I think the idea of a red mane is cool, because the higher the altitude the more reddish auroras appear. I like to imagine a Boarealis leaving to climb mountains in the north pole, and coming back with a red mane. Maybe we could make the shiny red? Anyways without that it's a pretty decent length, and includes topics of discussion I've found most interesting like it's rivalry with Galaxy Turtle and having it roam.