JVLightningLover
Veteran Trainer
It would also make for a very nice little storyline where you and/or Lillie helped it along the way to becoming a legendary.
I've got to say, if we get to raise little Cosmic Poot, and eventually it blossoms into a Legendary (which I'm 99.99% sure will be the case), I'll probably be more endeared to Solgaleo and Lunaala than any other Legend. It's a really smart play on GF's part.
I wondered if it might be Electric/Rock. It's got what looks like metal shavings stuck to it, sort of like Probopass, but I wonder if maybe it's a result of electrical energy?
What about Alolan Dugtrio?
Ground/Fairy, Ground/Fire, and Ground/Electric are my guesses.